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Marsa Alam

St John's Caves (Umm Kharalim)

  • Max depth20 m
  • CertificationOpen water / no overhead
  • Water temperature≈ 22–30 °C, varies with the seasonestimated, no reports yet

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What it looks like

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Videos and posts

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Other people's footage, not advice: how someone else dives here says nothing about what suits your team. Dive within your training.

The dive

Through the openings in the roof, beams of light fall on the sandy floor of the passages. Shoals of cardinalfish, moray eels and reef fish swim among the coral, and stingrays lie on the sand.

An extensive maze of passages and caves with hard coral and sharp rock all around: stay with your guide, keep the way back to daylight in sight and don't stir up the sediment.
Far from everything: the reefs lie 12–14 hours' sailing south of Port Ghalib, near the Sudanese border, and the current there can be strong and unpredictable. Agree beforehand with the boat how an emergency is handled.
Profile and sections

Through the openings in the roof, beams of light fall on the sandy floor of the passages. Shoals of cardinalfish, moray eels and reef fish swim among the coral, and stingrays lie on the sand. In the blue off the reef you may see grey reef and whitetip reef sharks, sometimes hammerheads early in the morning, and X-Ray Mag had dolphins join them on the safety stop.

The system is shallow enough for long dives and, per liveaboard.com, one of the finest caves of the St John's reefs. Emperor Divers also calls the site Umm Kharalim.

Practical: there is no pin on the map, as no source gives the spot. Per Emperor Divers, the cruise director may ask you to skip a dive that doesn't suit your experience.

Depth and profile
A maze of shallow caves, swim-throughs, chimneys and coral-covered tunnels; cracks in the reef open into caverns and overhangs. The dive goes from 5 to 20 m (Emperor Divers); UnderwaterPhotography.com gives a typical depth of 0–10 m.
Configuration
Mostly open passages with daylight through the openings, but an extensive maze: recreational gear with a torch, with a guide (estimate). Per the operators, good buoyancy control is a must.
Who can dive where
  • CaveAt least Open water / no overhead
  • Whole caveConfigurations: Backmount / twinset / Sidemount / CCR / Small cylinders / no-mount (speleo sumps)
  • Whole caveGoes down to 20 m (trimix or deco may be needed) · doesn't decide who may dive
Entry or dive feeThrough a dive centre or guide

This is how the planner decides who in your team may dive this cave. Rules your own trip adds (organizer, a mail, the AI) show with your trip.

How to get there

Only by liveaboard, on the routes to the deep south (such as South & St John's or Southern Solitude), mostly from Port Ghalib; dives are made from a zodiac. The reefs lie ~210 km south of Marsa Alam, 12–14 hours' sailing, close to the Sudanese border, in Elba National Park. Per liveaboard.com operators look for Advanced Open Water, experience with current and ideally 50+ logged dives; Dive The World calls the area one for experienced divers only.

Plan your route ↗

Around St John's Caves (Umm Kharalim)

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Sources, sharing and disclaimer

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Certification requirements, configurations and trimix depths are estimates for planning. Always check them locally and dive within your training. Compiled from web research (Oct 2026): the websites of Red Sea Diving Safari (site descriptions, diving pages and price lists) and ORCA Dive Club Wadi Lahmy (with pins for Shaab Claudio and Shaab Malahi), PADI (Claudia), Duikersgids (Sha'ab Claudia), Emperor Divers (2023) on the chamber and liveaboard.com on water temperature and visibility. These are guided boat and zodiac dives into caverns, tunnels and cave systems in the reef, with daylight through holes in the roof. Certification and configurations are estimates.