HMHS Britannic: Inside the World's Largest Shipwreck — The Promenade Deck

Almost no one gets inside HMHS Britannic, the world's largest shipwreck. Access to the inside is restricted by the Greek government and the ship's owner — granted only to a handful of elite divers. But there is one place where the outside meets the inside: the Port Promenade Deck. Over 100 metres long, stretching from stern to bridge at depths down to 83m, the Promenade was designed for first-class passengers who never made it aboard. Instead, it became a corridor for medical staff and wounded soldiers. Today, it's one of the most extraordinary dives on the world's largest shipwreck — and this is the last dive of our 2026 expedition. In this video, I take you through the full promenade traverse alongside George — one of the most experienced Britannic divers in the world — plus Greg (inventor of the GBM rebreather) and Henry. We navigate light fittings, teak caulking, medical debris, and original fixtures that haven't been touched in over a century. The goal: reach the Cousteau plaque at 83m, placed on the wreck by Kevin Gurr, for one final photograph before we ascend into 120 minutes decompression.It's a dive that demands discipline. Strong current, strict team protocols, and the constant pull of doorways I wasn't allowed to enter. HMHS Britannic doesn't give up its secrets easily. HMHS Britannic sank on 21st November 1918 after striking a mine in the Aegean Sea. At 48,158 tons, she remains the largest ocean liner ever lost — and one of the most hauntingly preserved wrecks in the world. ━━━━━━━━━━━━━━━━━━━━━━ *CHAPTERS* 00:00:00 Inside the World's Largest Shipwreck 00:01:06 Kitting Up For Britannic 00:02:35 Descending Into The Deep 00:04:03 First Sight Of Britannic 00:07:37 Entering The Promenade Deck 00:15:14 Squeezing Through The Exit Doors 00:18:26 Racing Across Britannic’s Deck 00:23:23 The Cousteau Plaque 00:25:42 Currents, Deco & The Ascent 00:31:06 Leaving Britannic Behind