The turtlekin gives a distracted thumbs-up, distracted as he paws around for the release... Ah! There it is! He wriggles between things to get into a better position to haul it open so he can slip inside.

The good news for Harlock is that it is indeed something that's just fallen over. As he approaches he can see the keg lying on its side, still rolling slightly from side to side as it settles. The cork's popped loose from when it had fallen over, a dark liquid pouring steadily out. Oil perhaps. ...which...shouldn't be a problem so long as there's nothing to catch fire, right...?