Rule Question about Deep Water and Damage

[GameAddict]

Okay as my subject says I am looking for damage rules related to depth.

Spoiler:

I have a game taking place and a section of it takes place on the water, the players are aware of the water depth and a possible deeper trench. The ship they where on was attacked and is sinking the full conversion borg in the group has decided he will go down with the ship. I reminded him about the depth of the water as the rest of the group fleed to a life raft.

What book has the damage from deep water or what rules do you use.

[Jefffar]

Rifts Underseas has the rules for deep ocean.

Even if the Borg is lucky enough not to exceed his crush depth and has a way to breathe underwater, it will be a long time before he can be rescued or find his way back ashore.

[GameAddict]

Underseas mentions max depth but no damage table for exceeding that. I was looking for something with a chart of some kind for dmg and crush.

[Jefffar]

The damage for exceeding it is . . . death.