Trench stages 10, 15

Stage 10: The Descent
You'll start in a cramped, flooded section. The main challenge here is the limited visibility and the close-quarters combat. Keep your handgun ready and aim for the head if you can, but don't waste ammo trying for perfect shots if you're being rushed. Look for ammo stashes in lockers and behind crates. There's a point where you'll need to swim; keep an eye on your oxygen meter and surface whenever it gets low. You might encounter some tougher enemies here, so use your dodge (tilt the analog stick forward or backward + B when an enemy attacks) to avoid damage.

Navigating the Flooded Corridors
As you progress, you'll find yourself in more flooded corridors. These areas often hide useful items, so take a moment to check behind debris and in submerged lockers. Remember your map can be a lifesaver here, showing you the general layout and your objective.

Stage 15: The Gauntlet
This stage is a real test. Expect more enemies, and potentially some new types. The layout might involve more verticality or complex pathways. Prioritize targets and don't get surrounded. If you've found any grenades, now's a good time to use them to clear out groups of enemies.

Conserving Resources
Throughout both stages, ammo and health items are going to be scarce. Always pick up every bit of ammo you find, even if it's for a weapon you don't use often. If you're not critically injured, save your green herbs for when you really need them.

Environmental Hazards
Keep an eye out for any environmental hazards. Sometimes, shooting explosive barrels or triggering traps can help thin out enemy numbers.

Boss Encounters (If Any)
If there's a boss fight in these stages, remember to observe its attack patterns. Dodging is crucial, and exploiting any weak points you discover will make the fight much easier. Don't get greedy with your attacks; get a few hits in and then focus on dodging.