Submarine, would you be going to 13,000 feet? >> no. these guys are going ten times deeper than we go. there's no real need on a military basis to go that deep. typically oil drilling, deep sea cable drilling and exploration here. >> what kind of training -- i know there's intensive military training, bit physiologically, what do you need to do to acclimate to those depths or is it so pressurized that, you know, that it does not matter? >> i think it's closer to your second statement. they're basically passengers. there's not a lot they can do. the pressures are so great that if something star...