As Tim Gerard said back in post #8, "I intend this post ONLY as a short review of the episode. I do not intend this, at all, to start another debate on this forum regarding the mystery ship."
As a documentary, it lacks objectivity and pushes sensationalism. There was nothing new as far as I could tell except for some reference to the log of the German boat that sank the Mount Temple in WW-I, where the skipper described the MT as having 4 closely spaced masts, and then goes into quoting Boxhall from 1912 who, when describing the mystery ship, said: "the masts were pretty close together."