Take the tour ×  The game seems to let you swim as deep as you
want. Are there ever any items to be collected? Or any danger
under the surface of the water (like sharks) ?  share|improve
this question add comment  2 Answers  up vote 12 down vote
accepted  Yes, there are collectibles underwater - mainly black
boxes that you need to gather for the Reapers. Look for the blue
"blips" on your map and you will see that some of them appear in
the ocean.  I've yet to encounter any dangers underwater,
though, so I don't think there are any sharks or the sort.
share|improve this answer add comment  As Ragnar said - black
boxes. I don't think I've found anything else under water. Most
of the boxes are in the shallow areas, and none of them are very
deep.  The only danger underwater is running out of oxygen - but
this takes a surprisingly long time to do. As a result, diving
turns out to be a good way to shake off excessive heat. You
don't have to get down too deep before even the helis either
can't see you, or their bu