Depth charges in the game do three things. They explode at set depths, they explode if they touch the submarine and they explode upon hiting the bottom. Hedghogs will explode upon contact with anything larger than a shrimp.

I was hedghoged in shallow water once and the concussion was so great it lift my U-boat to the surface where the crafty submarine though it was surface time and did not return to its below water level after exposing us all to a hail of escort gun fire and promptly sinking 300 yards off shore in Portsmouth Harbor.


Modern submarines can go to 3000. No, I will not explain.