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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.
Who to callRoatan Institute of Deepsea Exploration (R.I.D.E.) / Captain Karl Stanley$500pp for the 1,000 ft expedition (1.5 hrs, double-occupancy basis; 19% Honduran tax not included). Deeper 2,000 ft trips price hourly at ~$1,200/hr split among up to three passengers; most pick a 3-4 hr dive. Optional six-gill shark bait drop +$500. Book direct: subkarl@gmail.com / +504 3359-2887.
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Beats the shipNo honest comparison exists -- cruise lines do not sell this; it's a direct-only, bucket-list splurge. Port-day note: the 1.5 hr/$500pp expedition fits a port day with margin, but the longer deep trips eat most of your day, so book the earliest slot, coordinate directly with Karl on your ship's all-aboard time, and treat the deeper tiers as 'only if your port window is wide.'
What to expect, timing & how to book →