Transcription: This secret is very cool. This is the last main room of the hidden level. See that tower in the middle of the water? If you jump underneath, you'll see that one of the walls is a different color. Shoot at it, it'll open up. Depending on the level of difficulty you're playing it at, there may be some opposition, such as these barracuda sharks. Notice I had to come up for breath. Don't let them preoccupy you. You need to breathe. All right. Once we get them out of the way, pick up the power-ups. There's some ammo. Once inside, you'll find some health, jacket armor, and of course, invulnerability ...
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