The SDV is a well the wet Submersible so you're not in this thing dry. You really had to have a good eye to be able to read the obstacle avoidance sonar. They've gotten much better today But back then the technology just wasn't very good. So we tended to run into things every once in a while And then you just it was fiberglass that you bring it back in and the Master Chief who was our fiberglass guru would fix up a new one.