Aida
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.
The Aida served Egypt's lighthouse stations, and in September 1957 heavy seas drove her against the island she was provisioning. Her stern section now hangs on Big Brother's slope from about 30 meters down toward 60, angled with the terrain so that swimming her feels like descending a staircase built by accident. Soft corals sheath the railings, glassfish smoke through the superstructure, and the surrounding wall keeps offering sharks to divers who look away from the steel. The depth does the editing here: recreational visitors get minutes at the upper works before the ascent, while trimix teams treat Aida and the deep Numidia as a paired itinerary. Skippers brief her with respect - the same weather that sank her still sets the schedule.
The moment you come for: A deep, coral-sheathed hull on a dramatic slope; pairing with the island's shark traffic; a true depth-discipline dive.
Topography: A supply vessel's hull lying bow-down on the steep slope between roughly 30 and 60 meters
Entry: On Big Brother's northwest side; usually combined with the island wall, with strict depth and time gates.
Know before you splash
Hazards: Serious depth with short no-deco windows; current on the exposed corner; overhead sections for trained teams only.
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
Dogtooth Tuna
Giant Moray Eel
Grey Reef Shark
Lionfish
For photographers
Wide angle: ★★★★☆ · Macro: ★☆☆☆☆ — editors' 1–5 rating of what this site gives each style of shooting