The Elder engineer looks like one of the fish-man hybrid Elder gods who founded Atlantis in the Greek myths. Very cool i love how he's all weird looking like that. Some of the Titans/Elder gods are depicted as hybrid fish beings. Particularly the ones involved in the creation of Atlantis. A group of tall white beings who look like us, but were said to precede us, come from an island, and have contact with some of our oldest civilizations that then speak of them in their myths. '10 000 BC' said it best with something like "some people say they come from the stars or skies, others say the ocean". I think it's a bit of both. They may have started the Atlantean kingdom that inevitably dies out and falls into the ocean.