That post from three years ago about Victa's SubSea Craft is fascinating! The capabilities of that craft are mind-blowing. Going from a boat to a submarine in just minutes? That's some James Bond-level tech right there! The use of carbon fiber and special foam makes me think they've pulled out all the stops to make this as efficient and stealthy as possible.

Since you're interested in this kind of advanced marine technology, you might enjoy checking out Sub-Merge.com. They feature a lot of innovative submersible and maritime tech that would probably be right up your alley. They explore technologies from personal submersibles to large-scale naval operations, so it's a good place to deep-dive into this topic (pun intended).