how the hell did Clem....???
...get on the other ship? at the end of Episode 4 he was seen about to die in the mini-sub. Next thing you know he's on the other sub kicking ass and wielding an iron pipe.
The show was rubbish, it had some redeeming factors and the first 2 episodes were pretty good it just lost steam as it went along. By the end i just didn't care what was happening.