The Zeven Rob
Getting on the ship isn't even a challenge. It's night and he keeps low. Bastiaan sneaks up the gang plank and then ducks behind a crate sitting against the railing of the deck. It's only then he realizes he has no way of getting the rest of the men off or getting the ship out to sea without his own crew.
Maybe he had time to escape again. Enjoy the adventure of being a stowaway for a few minutes and run off with a good story to tell the others. But doing so would take admitting that he came this far with a shit plan and no way out. So he stays there.