>>1547646
Have I got the tip for you... Arguably the greatest underwater discovery of all time happened right in your time frame, in 1985, when they discovered the Titanic! Look for pictures of the Robert Ballard expedition, 1985-1986.

https://www.whoi.edu/ocean-learning-hub/multimedia/first-photos-from-the-discovery-of-the-titanic/

Also not directly from the era but it's some inspo you might find relevant, The Life Aquatic With Steve Zissou
https://www.youtube.com/watch?v=rMnGpEzrHoM