NBM Dive Site Resource
SM UC-66 — tentative attribution
North of the Isles of Scilly, Isles of Scilly, United Kingdom
Divers confirmed a WWI U-boat wreck north of the Isles of Scilly in 2009. Innes McCartney tentatively attributes it to SM UC-66.
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Featured Hero Photograph
Aquatic life at this dive site
What divers may encounter
Three reviewed connections are featured here. Sightings vary by season, conditions, and chance, so they are never guaranteed.
Aquatic life research in progress
NBM is reviewing a likely local species for this position.
Aquatic life research in progress
NBM is reviewing a likely local species for this position.
Aquatic life research in progress
NBM is reviewing a likely local species for this position.
Site media
Photographs
Three views rotate from the published gallery on each visit.
Contributor media
Dive videos
Three featured video positions are reserved on every profile.Regional location and nearby land
Location map
The map shows the islands and the broad area of the dived wreck. The UC-66 attribution is tentative.Map data © OpenStreetMap contributors
Recent field observations
Diver-reported temperatures
Automatically checked observations from dives during the past 14 days. Three reports are visible at a time; scroll for more.A report that passes the automatic checks will appear here with the dive date, diver’s display name, and temperatures at each depth.
Reports are automatically checked for plausible dates, depths, and temperatures. They are observations, not forecasts; confirm conditions before diving.
Why divers know this place
Highlights
Divers including Mike Etheridge observed German naval fittings and damage forward of the gun. McCartney compared those observations with the May 1917 air-attack report. The wreck’s identity remains tentative.
Shipwreck-only module
The wreck
This section appears only on shipwreck records and brings the vessel, its loss, present condition, access, and responsible wreck-diving considerations into one place.
- Vessel type
- Type UC II submarine
- Year built
- 1916 (commissioned)
- Year sunk
- 1917
- Cause of loss
- A Royal Naval Air Service attack on May 27, 1917 is a possible cause of loss. The wreck attribution remains tentative.
- Present condition
- Divers reported a break forward of the conning tower. Present condition is unverified.
Before you arrive
Access notes
Wreck research. Tentative attribution. Current access unverified. The map shows the surrounding region.
Plan within your training
Conditions and hazards
Extreme depth, offshore conditions and reported historical ammunition. Current conditions are unverified.
Independent resource notice
This record is a starting point for independent verification. Access, closures, moorings, weather, currents, depth, visibility, operator availability, and site conditions can change without notice. Confirm current information with the responsible operator, property owner, managing authority, or another qualified local source before planning or attempting a dive.