The Grisly Grotto

Secret 1

This one is not exactly a secret, for if no one has noticed them, by now, they are quite thick!! All you do is from the start of the level go through the entrance to the room with the spiral staircase, and shoot the red symbols when you see them. On the platform there is yellow armour.

Secret 2

This secret is not obvious to begin with if you are not looking for it.

When you have collected your armour from above follow the stairs, or jump, to the bottom of the room and out of the small tunnel.

Get the biosuit and enter the water. Turn to your right and you should see the following

You will be able to see a lighter section (Outlined) go towards it and when you reach it go up. There you will find some rockets.

Secret 3

This is a more complicated secret, where you have to fulfill some criteria before the secret is revealed.

Look at the image above. You can see a large square, and bright, spot just under the water's surface and to the right of secret #2. Go for that and you will come out to dry land. Go straight forward, through the door, and turn left. Turn right at the end. Then enter the room with the green slime. Take the lift up, and get off, you should see the following.

Enter one of these holes and look around. You should see one of these.

Push this, then jump to the path between the slime pools and go back up the lift. Choose the other hole, which you didn't go through and push the button at that side.

You will get a message "An underwater cave has opened".

What you do is go back to the big pool where Secret #2 is. When you just enter the pool and you are underwater you should see this.

When you enter into the cave an surface you will notice a ring of shadows, grenade launcher, and some health. Not to mention the Big Slipgate into the Ziggurat Vertigo

There is no more secrets on this level.