Sultan Rock
The uncharted rock that tore the bottom out of a Victorian ironclad, now a shallow boulder garden off Comino's southeast corner. Rarely dived, mostly because the current through the channel has opinions.
OtherDivers rarely, if ever, come here.
We found no record of anyone diving this site. It is charted so the picture of what lies under the water is complete, not because it is a place to go: there is no set route, no local briefing to lean on, and nothing on this page has been proven in the water.
Sea conditions
Stay dry right now
Sea is up (3.2 m NW) · Fresh WNW wind (58 km/h) · Gusts to 96 km/h
Done for today. Tomorrow: not looking good. Best it gets is 24 at 17:00: Sea is up (1.3 m NW)
Forecast for the site, updated 19:45 · Models disagree
Measured at Ċirkewwa (4.2 km away, 20:29): 63 km/h from WNW, gusts 71. The next hours lean on it.
- Waves
- 3.2 m
- from NW, biggest 4.0
- Wind
- 58 km/h
- WNW, gusts 96
- Swell
- 0.5 m
- 10 s period
- Sea temp
- 22 °C
- air 18 °C
Hour by hour
Next 7 days
0 3.2 m46 W
0 3.0 m45 WNW
55 0.9 m14 W
87 0.4 m13 ESE
81 0.5 m12 E
76 0.5 m18 NNW
83 0.5 m15 SW
Sunrise 06:25, sunset 17:06
Waves: Copernicus Med-Waves 4 km + MFWAM 8 km + EWAM 5 km + ECMWF WAM 9 km. Wind: ICON-2I 2 km + ECMWF IFS 9 km + ICON-EU 7 km + UKMO 10 km + ARPEGE 11 km. Read a few km out on the side the site is open to, then blended.
Exposed to wind and swell from: NE (45°), E (90°), SE (135°), S (180°). Sheltered from the northwest, which is its saving grace, but choppy and current-swept from the eastern half of the compass. Best attempted on a settled day with a light northwesterly and, if you can time it, around slack water. Visibility is usually good, commonly 20 to 30 m. Best season: June to September, on calm settled days only..
The dive
This is a dive you do for the story. The rock sits off Comino's southeastern corner, an unremarkable lump of limestone that in March 1889 ruined the day of one of the Royal Navy's more imposing warships. Underwater it is a field of big boulders draped in algae, with sea cactus and peacock's tail weed carpeting the tops, thin Posidonia in the gaps, and the occasional unmistakably manufactured fragment of iron lying among the rubble where a very expensive salvage operation once took place.
Depths are modest, eight metres on the shallow shoulders and eighteen at the deepest, so gas is not the limiting factor. Current is. The southeast corner of Comino sits where the channel squeezes between Comino and Malta, and the flow can run strongly enough to turn a gentle boulder pootle into a workout. That, plus the ferry route passing nearby, is why this site shows up on almost nobody's standard schedule despite being shallow and pretty.
Go in expecting small and abundant rather than big and dramatic. Wrasse working the seagrass, painted comber perched on rock, a grouper watching from a gap, a moray with its head out. Bring a torch for the undercuts and enough attention for the current.
- The rock that sank a Royal Navy ironclad in 1889
- Occasional iron fragments left over from the salvage
- Shallow boulder terrain thick with algae and small life
- A corner of Comino almost nobody dives
Typical plan
Drop onto the boulder tops at 6 to 8 m, work down the seaward side to around 16 to 18 m keeping an eye on the flow, and quarter the rubble for wreckage fragments. Turn well before you are tired, come back up the boulders and spend the last twenty minutes at 6 to 10 m in the seagrass gaps. Forty-five to fifty-five minutes on a 12 litre cylinder, air is plenty. SMB deployed from depth, and a firm agreement that the dive ends if the current builds.
What the bottom looks like
- 1Algae-covered boulder tops7 m deep · under the boat
- 2Scattered iron fragments from HMS Sultan14 m deep · 40 m from the boat
- 3Rubble and sand at the deepest point18 m deep · 75 m from the boat
- 4Thin Posidonia between the blocks12 m deep · 120 m from the boat
- 5Shallow shoulder for the ascent6 m deep · 165 m from the boat
Large algae-covered boulders over rock and rubble, with sparse Posidonia meadow and sand filling the gaps between blocks.
Who you might meet
Lucky day
Marked ones can hurt you. What they do and what to do about it is under Getting in and staying safe.
Getting in and staying safe
Only for serious professionals who know exactly what they are doing. With no record of anyone diving here there is no one to ask and no set route, so treat every line below as the start of your own planning, not a briefing. Plan it as an expedition, not a dive.
Boat only, and not a routine stop, so expect to charter or to join a club trip rather than find it on a centre's daily list. Crossings from Ċirkewwa or Mġarr are short. There is no mooring, no shelter and nothing on shore. Ask the skipper to work the slack rather than the flow, and agree the pick-up plan before you get wet, because if the current takes you it will take you out into the channel.
- Strong and variable current through the channel, the main reason to be careful here
- Ferry and commercial traffic on the Malta to Gozo route nearby
- Surface chop even when the rest of Comino looks calm
- Sharp corroded metal fragments from the 1889 salvage
- Rarely dived, so briefings are thin and nobody is nearby if it goes wrong
- Drift risk away from the boat, deploy an SMB early
Marine life to respect
Mediterranean moray · Morina Can hurt you
Bites hard if a hand goes into its hole. Keep hands out of cracks and never feed one.
Red scorpionfish · Ċippullazza Can hurt you
Venomous spines, and it sits still on the rock. Look before you kneel or hold on; hot water if stung.
A bit of history
HMS Sultan was a British central-battery ironclad of 1870, and on 6 March 1889 she struck an uncharted rock in the Comino channel during torpedo practice, opening her bottom. She flooded slowly and then, in a gale on 14 March, slid off the rock and sank. That was not the end of her: the Italian salvage firm Baghino and Co raised her in August 1889 for a fee of around fifty thousand pounds, she was patched up at Malta Dockyard, and in December she steamed home to Spithead under her own power. The rock has carried her name ever since, and small pieces of wreckage still turn up among the boulders.
Divers say
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Further reading: Calypso Sub-Aqua Club: Sultan Rock · Divers Guide: Sultan Rock · Wikipedia: HMS Sultan (1870) · Spunt: The day HMS Sultan struck an uncharted rock off Comino