This is my first post and map so keep that in mind if something is wrong with it.
Im not sure if the images are going to work or not. I guess we'll see.
Hope to see some comments they are appreciated.

This is a game-type and variant based on infection.
If on the human's team you spawn on a sinking ship and slide into head high water where debris float by from the ship's cargo.
If on the "zombie's" team you spawn in a cave. You are a shark and your mission is to "eat" all of the humans who are shipwrecked (hence the map name).

If a shark eats you then you become a shark and will spawn in the cave. Sharks have the evade ability and can move at 150% speed, although they cannot jump because they are sharks.
The best way to survive is to jump from rock to rock and from crate to crate.
Or work as a team and hold out on the green island near the center.
Sharks also have a weak invisibility cloak but it makes them impossible to see if you are above the water. Keep and eye out for splashes moving quickly around in the water. That's a tell tale sign of a shark.

Humans spawn with infinite ammo and are equipped with shotguns and magnums.
Sharks have swords.

Link to gametype:

Bungie.net : Halo Reach : File Details

Link to map variant:

Bungie.net : Halo Reach : File Details

Here are some pics: