Trinity Caves
Depth is the range from the top of the site to its usual maximum; "recommended cert" is the mainstream-agency level operators usually ask for, not a legal rule. Currents and visibility change daily — treat everything here as planning ranges.
Trinity Caves is West Bay's architecture dive. Three sand-floored ravines run seaward under bridges of coral, deep and narrow enough to feel like hallways, then deliver you through arches onto the open wall at twenty meters — a doorway moment divers replay on the boat afterward. Sea fans crowd the ravine rims, groupers and filefish idle in the shade, and the sponge growth thickens the moment you clear the wall lip. It is the approachable version of the canyon-and-arch terrain that defines Cayman's best wall diving, minutes from the busiest beach on the island.
The moment you come for: Ravine-and-arch passages, the doorway exit onto the wall, classic West Bay convenience.
Topography: Three parallel ravines — more canyon than cave — winding through the reef crown to openings on the wall face.
Entry: Moored West Bay site minutes from Seven Mile Beach operators.
Know before you splash
Hazards: Semi-enclosed passages concentrate careless fins; watch depth at the wall exits.
Conservation: Mooring-only marine-park site under heavy daily use.
Nitrox: Worth it here — profiles sit in the range where enriched air meaningfully extends no-stop time (with the training to use it).
Who you'll meet
Great Barracuda
Green Sea Turtle
Hawksbill Turtle
Porcupinefish
For photographers
Wide angle: ★★★★☆ · Macro: ★★☆☆☆ — editors' 1–5 rating of what this site gives each style of shooting