You assume the bomb was placed, and not dropped with weight or with underwater "drone"[0](Hilarious). 80 meters is probably not too deep for Sonar/Lidar for spo

You assume the bomb was placed, and not dropped with weight or with underwater "drone"[0](Hilarious). 80 meters is probably not too deep for Sonar/Lidar for spotting the pipe, Xprize Ocean discovery comes to mind. In addition top free diver athletes do dive for 80+ meters[1]. [0] https://www.youtube.com/watch?v=FwIWG5_rgC0 https://www.youtube.com/watch?v=FwIWG5_rgC0 [1] https://www.youtube.com/watch?v=aV2kBfhqkGk https://www.youtube.com/watch?v=aV2kBfhqkGk