In offshore prospecting a ship tows a sound source and underwater phones. Sound waves are generated by a pneumatic device that works like a balloon burst.
在近岸石油勘查中，勘探船牵引着一个声源以及水下捡波器。一个气动装置发出声波，就象气球爆炸那样。
3
Both wet and dry underwater welding operations are presented to repair the burst at the welding seam of large size crossing steel pipe.