Submersible Speedboat

DeckhandDave

Has anyone here actually seen a submersible speedboat in action that isn’t just a gimmick from some rich guy’s yacht toy? I’ve been boating for over 30 years, from racing catamarans to deep-sea fishing charters, and every time I hear about these “hybrid” vessels that promise to zip along the surface at 50 knots and then dive like a mini-sub, it sounds like marketing hype over engineering reality. Sure, prototypes like that Icon A5 or whatever they’re calling the latest one pop up at boat shows, but where’s the proof they hold up in rough seas without turning into a floating (or sinking) liability?

I’m calling BS on the claims-water resistance at speed underwater? Battery life for anything beyond a 10-minute joyride? And don’t get me started on certification; how does the Coast Guard even classify these things without mandating submarine-level training for every weekend skipper? If you’re out there with real experience (not just YouTube vids), spill it: is this the future of personal boating, or just another way for manufacturers to fleece us with unproven tech? Let’s hear some hard data, not dreams.

SaltyCaptain

I’ve got a buddy who crews on superyachts out of Monaco, and he swears by the U-Boat Worx C-Explorer 5-it’s not exactly a speed demon on the surface (tops out around 8 knots), but it dives to 300m and handles real currents without drama. No BS, he’s logged hundreds of hours on it in the Med, and it’s certified by DNV GL, not just some toy. Battery life’s solid for 8-10 hours submerged at low speeds, but yeah, surface zipping? That’s where the hype dies. Seen any rough-water tests on those faster hybrids like the SEMAFORe? I’d love links if you’ve got ’em-let’s separate fact from flash.

AquaPathfinder

Dug into SEMAFORe a bit-it’s that Norwegian semi-sub concept, right? Found a 2022 test vid from their trials in the North Sea; it punched through 2m swells at 40 knots surface before submerging smoothly to 20m. No leaks, stable as hell, but battery only gave 45 mins submerged at speed. Promising for charters, but yeah, needs more open-ocean proof. Who’s got access to the full report? Excited to see if it scales!

oceanescapee

Haha, scaling up SEMAFORe? Good luck with that in anything beyond a fjord-those North Sea trials were scripted perfection, but I chased down the 2023 follow-up from NTNU (their Norwegian backers) and it’s telling: structural fatigue showed up after 50 cycles in simulated 4m waves. No public full report yet (emailing them bounced), but the abstract hints at beefier hull composites needed for production. Teasing aside, if you’re chasing real-world grit, check SubSea Craft’s Piraya. Ex-special forces lads built it for black ops, hits 45 knots surfaced, dives to 100m in under 60 secs. My charter captain pal ran one off Gibraltar last summer-rough Med chop, no drama on transition, 2-hour submerged cruise on batteries at 6 knots. DNV-classed as a submersible craft, not a boat, so Coastie oversight is minimal (treats it like a dive platform). Downside? $3M sticker, and recharge takes 4 hours dockside. Future for pros, maybe, but your average bay runner? Still wallet-bait. Anyone clocked hours on a Piraya outside demos? Raw logs, not press releases.

bowlinebill

Piraya’s stealth creds are wild, but how’s the recharge in remote spots-no shore power? Total noob here, does it run diesel aux or pure electric? Links to real ops logs?