Operator briefing describes igloo-shaped coral domes, a small submerged observatory structure, and moderate current; reef top around 10–12 m with sand near 22 m.

Lists Igloo as an offshore Diani reef with hard corals, sponges, schools of fish, and turtles; cites max depth around mid-20s meters.

Notes the igloo structure as an artificial reef habitat with reef fish, moray eels, and occasional turtles.

Scientific study references Igloo as part of the Diani-Chale reef section, confirming site identity in the local reef system.