GTA San Andreas Lung Capacity: Train for Amphibious Assault

To increase lung capacity in GTA San Andreas, spend time swimming underwater, then return to the surface before CJ’s air runs out. Repeat this in a safe area and check the Lung Capacity statistic to confirm progress.

Swimming only on the surface is not the same training. If Woozie refuses to start Amphibious Assault because CJ cannot handle the diving, practice underwater rather than making a long surface swim across the map.

Lung capacity versus stamina

Lung capacity affects how long CJ can remain submerged. Stamina affects sustained physical activity, including swimming. Improving one statistic should not be mistaken for meeting a requirement associated with the other.

Watch the underwater air meter separately from the permanent statistic. Refilling the air meter keeps CJ alive during the current dive; increasing lung capacity improves his ability over repeated training.

A safe underwater training routine

1. Make a manual save before heading to the water.
2. Choose calm water near an accessible shore or exit.
3. Enter the water and let CJ’s air meter fill.
4. Dive and swim a short circuit below the surface.
5. Surface before the air meter empties.
6. Wait until it recovers, then repeat.
7. Check Lung Capacity in the statistics menu and save after making progress.

Stay close enough to the surface that you can recover comfortably. Diving to the seabed adds risk without being necessary for an ordinary training session.

Where should you practice?

Choose a quiet stretch of shoreline with a gentle approach. In San Fierro, look for an accessible waterfront spot away from boat traffic. Avoid locations where steep walls make it difficult to climb out.

The best location is one where you can repeat the dive-and-surface cycle without a wanted level, enemies, or confusing underwater terrain. You do not need to swim between cities.

How much lung capacity does Amphibious Assault need?

The mission requires CJ to improve his diving ability before Woozie will proceed. Published guides disagree on the exact percentage, so use your game’s statistic and mission response rather than relying on a single universal number.

A practical approach is to build a comfortable margin, then revisit Woozie. You do not need to maximize the entire statistic before trying again. Amphibious Assault is a nighttime mission, so also check its availability window, commonly listed as 8:00 PM to 6:00 AM in-game.

Preparing for the mission’s swimming section

Practice surfacing and diving deliberately before starting. During the mission, follow the underwater route and manage your air around patrols. Recover air at safe points instead of waiting until the meter is nearly empty.

When approaching an underwater passage, refill first. Entering with a low air meter leaves less room to correct a wrong turn. Follow the mission’s instructions for reaching the ship, planting the objective, and returning.

Controls on PC, console, and mobile

Check your edition’s swimming controls in the settings or on-screen prompts. Dive, swim, and surface inputs vary with platform and remapping. Avoid copying an old keyboard instruction if your version uses a different layout.

Frequently asked questions

Why did swimming for a long time not help?

If you stayed on the surface, you may have trained stamina without enough underwater practice for lung capacity.

Do I need to let CJ nearly drown?

No. Surface before the air runs out. Taking damage is unnecessary.

Why is Woozie still unavailable?

Check diving progress, story prerequisites, and the mission’s nighttime availability.