This is one of the only places on Earth where a member of the public can personally descend into the genuine deep sea. Captain Karl Stanley's hand-built sub Idabel takes three passengers down the Cayman Trench past bioluminescent creatures, glass sponges and -- on the deeper baited dives -- six-gill sharks. Nothing else like it exists for civilians anywhere in the Caribbean. It is the most extraordinary one-off on the island, full stop.
What to expect
You descend into the Cayman Trench aboard Captain Karl Stanley's hand-built submarine Idabel in a pressurized capsule with two fellow passengers, descending past bioluminescent creatures and glass sponges as the sunlit waters fade to deep ocean darkness. The 1.5-hour expedition reaches 1,000 feet; deeper dives (2,000+ feet) extend the experience to 3–4 hours, offering the rare possibility of encountering six-gill sharks on baited dives. This is one of the few places on Earth where civilians can personally experience genuine deep sea—nothing comparable exists in the Caribbean. The rhythm is intimate and unhurried: descent, observation of alien marine life, optional shark encounter (if booked), ascent.
Good to know
The 1.5-hour/$500pp standard expedition fits comfortably into a 6–8 hour port window; book the earliest available slot and coordinate directly with Captain Karl (subkarl@gmail.com, +504 3359-2887) to confirm all-aboard timing and ensure a safe back-to-ship buffer. Deeper 2,000 ft trips cost ~$1,200/hr split among up to three passengers and consume 3–4 hours total, leaving minimal margin; reserve these only if your port window is genuinely wide. Bring minimal personal items (the sub is compact); book your spot ahead directly—cruise lines do not sell this excursion—and add 19% Honduran tax to all quoted prices. Optional six-gill shark bait drop is +$500 if desired.
Sail there
Luxury cruises that call at Roatan — book through us, the fare is identical and your concierge stays on your side.