I think you've gotten the two core archetypal ideas:
(1) It's the whole "monsters from the deep" thing, and experienced by someone who has very Nefeshic orientation: He is obsessed, driven, hurling himself into survival elements, previously been damaged by it. There is something heroic but it doesn't rise to the heroic ideal. It's a hero-type quest by someone who is not in control of his impulses, has not healed his wounds, etc.
(1) It's the grail. But not the grail from an enlightened perspective, so a more distant grail. It eventually devours him, but not in an ecstatic Babalon way. It's the darkness of the depths, not the darkness of infinite space.
Also, they are inextricably bound - where one goes, the other goes, so it shows MB is part of his psyche (in case we didn't know). His final destruction is in ensuring he can never let go.
Love is the law, love under will.
Yours in L.V.X.,
Jim Eshelmanwww.jeshelman.com"Success is thy proof: argue not; convert not; talk not overmuch!" - CCXX 3:42