NBM Dive Site Resource
U-670 — Hel
Hel offshore, Pomeranian Voivodeship, Poland
A human-dived Type VIIC wreck north of Hel, identified as U-670 after an earlier U-346 attribution. Published dives report 76–82 m.
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Original NBM Artwork
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
Regional context around Baltic Sea north of Hel, Poland, including nearby land. Historical positions are not surveyed dive navigation fixes.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
Published reidentification of a Baltic submarine wreck, with human dives in 2015 and 2025.
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
- German Type VIIC submarine
- Year built
- 1943 (commissioned)
- Year sunk
- 1943
- Cause of loss
- U-670 sank northeast of Hel after colliding with the target ship Bolkoburg on August 20, 1943. Twenty-two crew members survived and 21 died. Published technical dives identify a wreck north of Hel as U-670.
- Present condition
- Diver accounts describe an upright hull with collision damage and net entanglement; no NBM condition survey.
- Penetration guidance
- No penetration or artifact recovery authorization is implied.
Before you arrive
Access notes
Diveland states permission is required. Published expedition dives do not establish current permission; confirm requirements with the Polish authorities and a qualified local operator.
Plan within your training
Conditions and hazards
Depth, cold water, fishing nets, damaged metal and possible ordnance. Respect the site as a maritime grave.
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.