Question for our ex-sailors?

[sarg]

I've just heard from the folks who are on a yacht cruising around Cuba and then on to the Caymans.

Or at least they should be.

They boarded on Sunday and have been in Cuban waters. Turns out though that it was the pilot's (is that the correct term?) first trip around Cuba and he's managed to get the boat grounded in mud.

After a 12 hour wait for a tug, they are now waiting for the authorities to issue some seaworthiness certificate before they can carry on their journey. The boat is effectively impounded right now.

Meanwhile, everyone on the boat, crew and passengers, have been arrested

And there is my question. Apparently this is standard maritime procedure, so I'd just like this confirming, and then ask why? If this was a cruise liner with several thousand people on board, would they really arrest every single one?