You could fly a helicopter out to any ship that isn't crossing the pacific or atlantic, but that would be $100,000-$300,000 per incident and it would very quickly not be worth it. There isn't much in-between for reducing crew since a couple people alone on a boat together will probably be homicidal in short order.
I'm curious, what breaks on a ship? I have no experience with anything over a few dozen feet. I imagine hydraulic systems could break and lead to Consequences, but I can't imagine there are many big systems that can be fixed at sea, even with a crane onboard. What kind of things get fixed at sea?
You might as well ask what doesn't break on a ship. Salt water corrosion, thermal stress, vibration, residue accumulation, and hull flexing due to large swells are really hard on equipment. Here's a good case study on the type of repairs that a merchant ship crew might have to perform in the middle of the ocean.
Ocean going merchant ships spend much of their time outside of practical helicopter range. And even when close to shore, winching a repair technician down to a disabled autonomous vessel that can't even keep its bow into the weather would be a dangerous affair.
I'm curious, what breaks on a ship? I have no experience with anything over a few dozen feet. I imagine hydraulic systems could break and lead to Consequences, but I can't imagine there are many big systems that can be fixed at sea, even with a crane onboard. What kind of things get fixed at sea?