Hell Let Loose Vietnam How to Use Tunnels as NVA: Complete Guide

TL;DR

• Tunnels are NVA-only — the US cannot build, use, or enter them.
• You need a Field Pad and the correct badge to place a tunnel. No supplies required.
• Only NVA Squad Leaders and the Commander can connect tunnels on the Tactical Map.
• Tunnels must be 100m–400m apart. Personal cooldown is 5 minutes per placement.
• The team cap is 12 tunnels, raised to 15 with a Commander ability.
• Tunnels are destroyed when territory changes hands — rebuild before you lose the sector.
• Treat tunnels as fast-travel links, not replacements for your whole spawn network.
• Concealment is everything — a found tunnel is a dead tunnel.

Hell Let Loose Vietnam how to use tunnels as NVA is the question that separates NVA players who hold objectives from those who keep feeding the enemy respawn timer. Tunnels give the NVA a fundamentally different defensive and offensive playbook from US forces — one rooted in concealment, indirect approach, and the ability to strike from positions the enemy believes to be secure. The US has helicopters and air mobility. The NVA has the ground under the enemy’s feet. Use it.

This guide covers everything from the first placement to advanced network strategy — how to build tunnels, how to connect them, how to travel through them, where to place them, and how to use them to win matches. For a direct comparison of how this system stacks up against US air mobility, our Hell Let Loose Vietnam US vs NVA guide breaks down both factions in full. If you are completely new to the game, start with our Hell Let Loose Vietnam beginners guide first.

What Tunnels Actually Do

Tunnels are the North Vietnamese Army’s answer to mobility in Hell Let Loose: Vietnam. Only the NVA can build them, and once a network is in place, players skip across the map without exposing themselves to US firepower along the way.

You do not physically crawl through anything. A short cutscene and a time skip play out, and the length of that skip depends on the distance between the two points you travel between. The further apart the connected points, the longer the transition. It is fast travel — hidden underground, invisible to helicopter reconnaissance, and inaccessible to any US player.

Tunnels cost no supplies and can be placed in neutral territory, making them far more flexible than Garrisons. That is the core advantage. A US Garrison needs supplies, coordination, and cannot push into forward territory the way a tunnel can. A tunnel costs nothing and can go almost anywhere.

Who Can Build and Connect Tunnels

Not every NVA player can place or link tunnels. The permissions are split clearly.

Placing Tunnels

Any NVA Squad Leader with the correct badge and a Field Pad equipped can place a tunnel entrance. No supplies are required, which means you can build even when your team is low on resources.

Connecting Tunnels

Only the NVA Commander and Squad Leaders can make the connections through the Tactical Map. Regular infantry cannot link tunnel entrances. If you are playing a non-leadership role, you can use a connected tunnel but cannot build or link one.

For the full picture of the Squad Leader role and how tunnels fit into that responsibility, our Hell Let Loose Vietnam Squad Leader guide covers it in detail. For the Commander’s tunnel cap ability, see our Hell Let Loose Vietnam commander guide.

How to Build a Tunnel: Step by Step

Step 1: Play as NVA

This is a hard lock. US players have no access to this mechanic at all. You must be on the NVA side before any of the following steps apply.

Step 2: Equip the Correct Badge

Check that you have the right badge on your character before you go to place. Without it, the tunnel option will not appear in your Field Pad menu.

Step 3: Get to Your Field Pad

Switch to your Field Pad with the scroll wheel or its keybind. This is the tool that holds all of your constructible elements.

Step 4: Select the Tunnel Option

Scroll through the buildables until the Tunnel option is highlighted. A placement preview will appear showing where the tunnel entrance will land.

Step 5: Find a Concealed Spot

Before placing, check your surroundings. Dense vegetation, hillsides, building interiors, and riverbank foliage are all good. Open ground, road edges, and visible hillcrests are not. Build in cover: treelines, dense vegetation, inside buildings, on reverse slopes. The longer a tunnel stays hidden, the more value it provides.

Step 6: Hold Left-Click to Place

Hold left-click to confirm placement. The tunnel entrance goes in the ground. Check the Tactical Map to confirm it registered before moving on.

How to Connect Tunnels on the Tactical Map

A placed tunnel does nothing until it is connected. The network needs a useful entry, a useful exit, and players who know the connection exists. Here is how to build that network.

Open the Tactical Map

As a Squad Leader or Commander, open your Tactical Map. Your tunnel entrances and Garrisons appear as icons you can click.

Click a Tunnel to Start the Connection

Click a tunnel icon to start a connection. This selects it as the origin point for the link.

Click Your Second Point

Click a second tunnel icon or a Garrison icon to complete the connection. Repeat to grow the network within the connection limit. You can chain tunnels to other tunnels and link them to Garrisons. Garrisons, however, cannot be linked directly to each other.

Confirm the Link

Look for the connection highlight in the Tactical Map to confirm the link is active. If the tutorial does not advance or no highlight appears, follow the connection highlight shown by the current build, disconnect and reconnect the intended endpoints, and avoid placing a second tunnel before confirming the first.

Connection Limits

Squad leaders can link tunnel entrances to Garrisons, letting the NVA fast-travel from a forward position to a flanking tunnel dug behind enemy lines. The documented launch limit on connections per network is four. The official July 30 balance update reduced this from five to four. Always check in-game after patches to confirm the current cap.

Key Tunnel Rules You Must Know

These rules govern every placement decision. Breaking them wastes your cooldown or produces a tunnel in the wrong position.

Distance Rules

Tunnel routes have a minimum range of 100 meters and a maximum range of 400 meters. You cannot stack tunnel entrances right next to each other, and you cannot connect two points that are too far apart. Plan your network distances before placing.

Cooldown

Tunnel creation has a 5-minute cooldown. This is per player, not per team. Wasting a placement on a spot you will abandon in two minutes is a five-minute mistake your squad will feel directly.

Team Tunnel Cap

The base limit for tunnels is a maximum of 12, but you can remove any tunnels you no longer need, and the Commander ability can increase the maximum to 15. Remove stale, compromised, or outdated tunnels quickly to free up slots for better forward placements.

Territory Rules

Tunnels can be placed in friendly, neutral, or unlocked enemy territory. This is what makes them more flexible than US Garrisons. You can push a tunnel entrance further forward than a Garrison can go.

Territory Flip Destroys Tunnels

A territory flip removes the tunnels that your side had built there. When the frontline moves against you, tunnels in that sector are gone. The solution is always to build the fallback tunnel before the sector is lost, not after.

How to Travel Through a Tunnel

Post-launch descriptions show players entering an attached network, choosing an exit, and travelling through a first-person transition to the connected destination.

You approach the tunnel entrance, interact with it, choose your exit point from the connected network, and travel. The transition plays out in first-person based on the distance covered. Longer connections take more time. Once you arrive, you emerge at your chosen exit point and continue on foot.

Treat a tunnel as a travel link, not a replacement for the team’s spawn network: establish a useful anchor, place a concealed destination, and connect the two from the Tactical Map. Tunnels are movement tools. Garrisons and Outposts handle the rest of your spawn infrastructure alongside them.

Tunnel Placement Strategy: Where to Place Them

This is where most NVA players make their biggest mistakes. A poorly placed tunnel is not just useless — it is a gift to US recon teams who destroy it and cut off your route.

The Three-Tier Network

The most reliable NVA tunnel structure uses three layers working together.

• Primary tunnel: Close to the active sector — within 150m for immediate reinforcement. This is your fast respawn option for the current fight.
• Secondary tunnel: 200–300m back in covered terrain. This is your fallback when the primary is destroyed or exposed.
• Tertiary tunnel: Near a river crossing, jungle edge, or flanking route. This creates pressure from an unexpected direction.

This structure means your squad always has somewhere to spawn even when the front collapses. A single forward tunnel that gets found and destroyed leaves you with nothing for five minutes.

Always Build Toward the Objective

Move to concealed terrain that shortens a real route to the active objective. Avoid obvious roads, open ground and positions the team will abandon immediately. The best tunnel placement cuts travel time to the current fight. A tunnel that saves your squad 30 seconds of walking is worth more than one that feels safe but is in the wrong sector.

Concealment Is Not Optional

A single tunnel near a capture point is a liability because recon squads can triangulate its entrance after watching a few spawn waves. If the enemy can see your squad appearing from the same direction every respawn, they know where your tunnel is. Build in dense jungle, inside buildings, on reverse slopes, or in riverbank foliage where no one is looking.

Never Place on Ground You Are Abandoning

The 5-minute cooldown means you must be deliberate about placement — do not waste tunnels on positions you will abandon. Before you place, ask yourself: will this sector still matter in five minutes? If the frontline is shifting away from this area, save your cooldown for a placement closer to where the next fight will be.

Think About Surprise, Not Just Distance

Do not think of the tunnel as a mere spawn point. Think carefully about where the enemy will least expect your team to appear. If you can get even close to that, you can bring the element of surprise, and that can be the key to your victory.

A tunnel that spawns your squad 50 meters behind the US front line is worth five times a tunnel that spawns you 100 meters in front of your own lines in perfect safety.

Advanced NVA Tunnel Tactics

The Decoy Tunnel

Veteran players report that a single visible tunnel entrance, deliberately left unguarded, will pull an entire US armor column and recon squad off the objective for several minutes. Place one tunnel in a slightly exposed location near a road or clearing the US team will naturally patrol. Let them find and destroy it. While they are doing that, your real network — hidden and connected — is doing the actual work.

Build Before the Sector Flips

When the capture bar turns against friendly territory, identify every link that will be on the wrong side of the new control line. The network operator should announce which route is about to vanish and which surviving spawn replaces it. Build the fallback tunnel the moment you see the capture bar moving against you. Do not wait for the flip to force your hand.

Remove Old Tunnels Fast

A tunnel in a lost sector is a wasted slot. Remove compromised and outdated entrances immediately. You can remove any tunnels you no longer need at any time from the Tactical Map. Keep your 12 (or 15) slots working forward, not backward.

Redundancy Beats Single Points of Failure

Building redundant tunnels with a decoy system keeps your spawn points alive while confusing enemy recon. If your only active tunnel gets found, your entire fast-travel network disappears in one action. Two hidden tunnels covering the same sector require the US to find and destroy both before they cut your spawns.

Combine Tunnels With Patrol Boat Spawns

Position a patrol boat in a narrow river bend where visibility drops below 50 meters, and have an Engineer place a tunnel on the opposite bank. A tunnel exit and a patrol boat spawn covering the same approach gives the US team two separate spawn points to find and destroy. Even a good US team will struggle to break both simultaneously. For more on how boats and tunnels work together, our Hell Let Loose Vietnam patrol boats guide covers the full river strategy.

Tunnel Plus Mortar Bait

Place a decoy tunnel in an open area that US armour will push through. Position a mortar squad 200 meters away with a firing solution on that entrance. When the US armour moves to destroy the tunnel, the mortar drops. The tunnel costs nothing. The trade — an armour column and its crew — is worth it every time. Our Hell Let Loose Vietnam mortar guide explains how to set this up correctly.

Synergy With Armour

Tunnel exits placed behind US anti-tank positions allow NVA infantry to eliminate AT threats before the T-54 pushes, clearing the way without exposing the tank. Coordinating a tunnel insertion directly behind a US AT player who is hunting your tank is one of the cleanest combined arms plays the NVA has available.

Tunnel Placement on Specific Maps

Where you place tunnels changes significantly depending on which map you are playing. Here is a quick overview for each launch map.

Van Tuong — River Foliage and Jungle Edge

On this coastal map, NVA use river foliage for infantry ambushes on boat traffic and jungle edges for tunnel placement. The jungle interior along the river network hides tunnel entrances from US helicopter spotting. Pair them with patrol boat ambushes at river bends for multi-layer pressure. Our Hell Let Loose Vietnam Van Tuong guide covers the full terrain layout.

Quảng Ngãi — Bamboo Forest and Caves

In bamboo forest with visibility reduced to near zero, the flanking squad can be invisible until they open fire. Tunnels placed inside bamboo sections are nearly impossible to spot visually. Pair them with cave systems for overlapping spawn coverage. Our Hell Let Loose Vietnam Quảng Ngãi guide has the full map breakdown.

Dak To Airfield — Jungle Edge and Fortifications

Build tunnel entrances inside the jungle edge vegetation rather than in the open — a tunnel entrance in dense vegetation near the runway flank is invisible to US helicopter spotting and difficult for infantry patrols to find. On this open map, placement discipline is critical. Open ground tunnel placements will be spotted from the air almost immediately. See our Hell Let Loose Vietnam Dak To Airfield guide.

Hue Outskirts — Inside Structures

Urban terrain on this map makes building interiors the priority placement location. A tunnel inside a defended structure produces soldiers that defenders cannot flank without entering. Our Hell Let Loose Vietnam Hue Outskirts guide covers where these structures sit.

Cam Ranh Port and Thanh Hoa Bridge

Both maps feature terrain that rewards tunnel placement near approach routes rather than right on objectives. Flanking tunnels that produce soldiers on the side of a US push are harder to identify than tunnels directly facing the frontline. See our Hell Let Loose Vietnam Cam Ranh Port guide and Hell Let Loose Vietnam Thanh Hoa Bridge guide for terrain-specific advice.

For a complete overview of all six maps and how tunnel placement changes across them, our Hell Let Loose Vietnam all maps guide is the best starting point.

Tunnels and the NVA Mindset

The NVA advantage comes from stealth, terrain, and unpredictability. The jungle is your teammate.

US players fight from known positions — helicopters are loud and visible, Garrisons are above ground. Everything the US does can be spotted from altitude. Everything the NVA does is underground or in dense cover. That is the entire point of tunnel warfare. Do not necessarily die defending a position just because it is there. Disengage. Reposition. Come back from somewhere unexpected. That is the whole point.

The tunnel system is what makes repositioning possible without exposure. Use it offensively, not just as a backup plan.

Roles That Work Best With Tunnels

• Squad Leader: Builds and connects tunnels. The most important tunnel role in the game. Our Hell Let Loose Vietnam Squad Leader guide covers tunnel coordination in detail.
• Commander: Raises the team tunnel cap from 12 to 15 via Commander ability and connects tunnels from the Tactical Map. See our Hell Let Loose Vietnam commander guide.
• Sniper/Recon: A Sniper who exits a tunnel behind US lines is one of the most dangerous threats in the game. Our Hell Let Loose Vietnam sniper guide covers deep infiltration tactics.
• Medic: Tunnel travel gets Medics to downed teammates faster than any foot movement. Our Hell Let Loose Vietnam medic guide explains how this plays out.
• Engineer: Maintains Garrison and Outpost infrastructure that tunnels connect to. See our Hell Let Loose Vietnam engineer guide.
• Mortar: Coordinates with tunnel decoys to bait US armour. Our Hell Let Loose Vietnam mortar guide covers the full setup.

For a full overview of all NVA roles and how each one supports tunnel warfare, our Hell Let Loose Vietnam all classes guide covers every role in plain language. Not sure which role to start with? Our Hell Let Loose Vietnam best class for beginners guide will point you in the right direction.

How Tunnels Compare to US Helicopters

The NVA and US should not build the same spawn network with different skins. NVA tunnels reward a moving, concealed chain that is rebuilt as territory changes. US helicopters create fast troop and supply insertions, then let an Officer establish a ground spawn with the Field Pad.

Helicopters are fast and visible. Tunnels are slower to rebuild but pressure the frontline from directions the enemy cannot see coming. Neither system is objectively better — they just require completely different approaches. For how the US helicopter system works, our Hell Let Loose Vietnam how to fly a helicopter guide covers the full flight and logistics system.

Common Tunnel Mistakes to Avoid

• Placing in the open. Any tunnel visible from a road or clear sightline will be found and destroyed within minutes.
• Placing too close to where you already are. A tunnel that is only 120m from a Garrison you already have adds almost no value. Push it further.
• Burning a cooldown on a sector you are losing. Five minutes is too long to wait for a rebuild in a dead zone. Save it for the next active sector.
• Not removing outdated tunnels. Tunnels in lost sectors fill your team’s slot cap. Clear them immediately and rebuild forward.
• Treating tunnels as the only spawn system. Do not abandon Garrison and Outpost work because a tunnel can be placed. The network needs a useful entry, a useful exit, and players who know the connection exists.
• Using only one tunnel. A single tunnel creates a single point of failure. Build redundancy before the enemy finds your first one.
• Not communicating tunnel locations to your squad. A tunnel no one knows about is a tunnel no one uses. Call out your placements in squad chat or voice.

Where to Get Hell Let Loose Vietnam

Hell Let Loose Vietnam is available now on PC, PlayStation 5, and Xbox Series X|S. Pick it up from the PlayStation Store, the Xbox Store, or visit the official Hell Let Loose Vietnam page.

Final Tips for Using Tunnels as NVA

• Place your tunnel before you need it, not after the frontline has already moved.
• Always check your surroundings for cover before placing. If you can see the sky clearly, so can a helicopter.
• Build the fallback tunnel while you still hold the sector. Never wait for the flip.
• Remove stale tunnels immediately. Dead slots hurt your team’s cap more than bad placements.
• Coordinate with other Squad Leaders so your tunnel placements cover different sectors instead of doubling up.
• Use one tunnel as a decoy. Let the US waste time finding and destroying it while your real network does the work.
• Always ask: where will the enemy least expect us to appear? Place your tunnels there.

The tunnel system is what makes the NVA faction genuinely asymmetric. Once you understand how to place, connect, conceal, and rebuild tunnels around the moving frontline, you will understand why experienced NVA players are so difficult to dislodge from objectives. For the weapons that work best when emerging from unexpected tunnel exits, our Hell Let Loose Vietnam NVA weapons guide and the full Hell Let Loose Vietnam best weapons tier list are your next reads. For a deeper strategic look at how tunnels fit into the full NVA approach, our dedicated Hell Let Loose Vietnam tunnel guide goes even further into placement theory, advanced tactics, and US counter-strategies.