Seafloor Mapping Sounds
The multibeam sends out a soft ping (12 kilohertz) and the sub-bottom profiler emits a chirp sound (3.5 kilohertz). These sound signals are sent from the ship into the seafloor and the return signals that bounce back are used to determine ocean depth. Some of you, but not all of you, will be able to hear the ping immediately (about half a second) before the chirp. I can hear these sounds faintly throughout the ship, whether in my room, the science lounge or the mess hall. This sound was recorded in my room.