Difficult to rule out...depends on where sound was coming from...could they triangulate it? Did microphone listen to a large area?
That whole fiasco makes me ill...go down 2.5 miles in some smart guys novel non-vetted invention.....just to get a glimpse of the gravesite of others...
“That whole fiasco makes me ill...go down 2.5 miles in some smart guys novel non-vetted invention.....just to get a glimpse of the gravesite of others...”
But if you can get a selfie there...
It’s not wrong to explore the deep.
Its wrong to skimp and skip on safety and brag how great your flawed submersible design is.