Submerged
Grab the rope and start pulling! If we arrived at the docks and saw that our boat was precisely where we left it… except now underwater, we would freak out. How this happened and how someone didn't see it happen is beyond us.
Of course, it could be because there was no one monitoring the boats when it happened, but surely people noticed it after the fact? It's not unspeakable, but it's definitely a big fail because the hole had to be pretty big for that boat to take on that much water. How come the captain didn't see it before he left? Hmmm.
