kebabking
Not a Girly Swot, but I like them....
they've had some bods on saying that if it had imploded violently such an event would have been picked up by hydrophones, so more likely that is has remained intact. which ain't nice
This is true and not true - it's quite likely that the sound of an implosion has been recorded by either the US geological survey or the SOSUS network, but both those systems record far more data than can be listened to in real time, so they use software to sift the wheat from the chaff. The USGS are listening for earthquakes, landslips and volcanoes, the USN are listening for screw noises, machinery, and transients like torpedo doors and dropped pans in the galley.
The USGS found that it had recorded the implosion of the ARA San Juan some years ago, but only after it spent a week going through its data.
The ocean makes a lot of noise, and wrecks like Titanic make even more - you'd probably avoid putting your hydrophones near a wreck simply because it would bombard your systems with noise that you weren't looking for, so if something occured near the wreck you might or might not hear it, and even if you did, you might or might not recognise it for what it was.