If you want to try reaching the bottom , make sure you hit softly or yes you will damage your boat. I wouldnt try resting in anything over 200' . I tried resting on the bottom... well I was forced to after my bow was half full of water. When they ping you they know your depth and the charges land on the ocean floor. Watched it happen with external camera... pretty cool. I am not currentlty using gwx. I am currently in 7/42 with some good mods. Just lost my flak gunners to some nasty Sunderlands. Dont use gwx yet cause I do like shooting down the planes, although this time it didnt work out very well.