"perform docking/unloading" LOL. Pull up on a beach in the middle of the night and grab the bricks out of the sub for the guys waiting for you there. This isn't a commercial port with cargo cranes, industrial equipment, and all that. As for handling rough weather, it's a sub. What's going to happen? It's going to sink?
Yes, it will sink. These are semi-submersible "narco-subs". They have weak hulls and little reserve buoyancy. They have very little margin for error in heavy seas.
> Pull up on a beach in the middle of the night and grab the bricks out of the sub for the guys waiting for you there.
Beaching (and getting off a beach) is a bit tricky for semi-submersible narco-subs. You need the right water depth for approach and departure - otherwise you can get grounded or stranded. Waves can swamp you. These subs are cheap - they have simple propulsion and little reserve power and have difficulty making tight corrections.
I am not sure why people are thinking it is as simple as driving your bike. It needs both training and experience.
