On this level, if you think you can't go anywhere else, remember that you can always run and jump to other platforms from a good height (for example, the stair room is a good example).
To avoid problems later, you can easily rocket jump yourself onto the central platform to get to the save terminal and shield regenerator. Just be ready to take out the Hunters there.
Make sure you jump into the small alcoves that are separated by lava pools from the main floor. You'll be rewarded with ammo and shield canisters that teleport in.
There are no known secrets on this level.
Marathon 2: Durandal - Level 27: Feel the Noise