There are no humans on this level. The choice of weapon is entirely up to you. Save your gas grenades as you may need them later. This level is a bit of a maze so try to remember the way you go so you won't go the same way again. Beware of falling rocks and falling lava as this is not good for you. Watch where you walk as fire sometimes finds a way to the surface. If you come to the triceratops you have gone the longer way so go back and try different doors. Save your shotgun pellets for when you're near the eggs as there is a heavy raptor population waiting for you.