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> How far does sound travel in the ocean?

> many kilometres

Not exactly the answer I was reading for.

Thousands of miles:

https://en.wikipedia.org/wiki/SOFAR_channel Analysis of Heard Island Feasibility Test data received by the Ascension Island Missile Impact Locating System hydrophones at an intermediate range of 9,200 km (5,700 mi; 5,000 nmi) from the source found "surprisingly high" signal to noise ratios, ranging from 19 to 30 dB, with unexpected phase stability and amplitude variability after a travel time of about 1 hour, 44 minutes and 17 seconds.[3]

Thanks for the link. I traveled on the Cory Choeust multiple times during the late 80s, though not on Heard island test. Very interesting working on SONAR in the 80s, both on surface ships and subs. Riding alone in the conning tower of an SSN in Exuma sound was fun. And saw a full rainbow in north Atlantic

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