How does cutting the propeller shaft endanger lives? The ship won’t move. This is exactly the type of hysterical thing I would expect these people to say.
Just guessing here...
I’d say if the prop shaft were damaged, the prop shaft seals might allow water into the engine room.
If many many factors are just right, the rotating prop or damaged shaft could contact/breach the hull.
It is very, very unlikely though. This method is probably the easiest and safest way to disable a ship after it is a few hours of days under way.
1. Engine damaged (not leaving the dock) (not sinking)
2. Propeller shaft section missing (not leaving the dock) (not sinking)
3. propeller damaged (not leaving the harbor) (not sinking)
Most are saying propeller because it is the only part on a boat they know.
One guy says he has seen the damage. No mention of him being a diver. (propellers are located UNDER the water) sarc.
We don't know what damage, exactly, has been done to what.
It would move, but it would vibrate and brake the prop off, doubt if it could sink the boat.