This guy (goes by the name "Jive Turkey" of all things) and does analysis of sonar acoustic recordings including ASW sonar pings. He also does analysis of various sub types.
Acoustic analysis of sonar pulses
ASW sonar pulses off Bahamas
Borei sub analysis
Something different for today ... a collaborative project between Grumman and Shin Meiwa in Japan.
Note wing engines can tilt up a few degrees (it's described on another page). Also, there is heavy reliance on active boundary layer control via twin turbines behind the rear pressure bulkhead...