HMS SAPPER - Cornwall & Devon

The HMS Sapper, a former trawler turned WWI minesweeper, sits upright at 29 metres, making her a genuinely compelling dive off the Cornish coast. We love wrecks with a bit of history, and this one certainly delivers – sunk by a mine in 1917, she’s a tangible piece of naval past. Dropping down, you'll feel the colder water, but it's worth it for the visibility, which can push past 15 metres on a good day. The wreck itself is remarkably intact. Her bow points east, and you can still pick out the triple expansion engine, a real highlight for us. The single boiler is also quite prominent, providing a great reference point. Schools of pollack dart through the structure, and the occasional conger eel peeks out from beneath plating. Our favourite part? The way the light filters through the broken deck beams, illuminating patches of jewel anemones that have colonised the metalwork. This dive suits those comfortable with deeper wrecks and temperate water conditions. The strong tides here mean slack water is crucial for an enjoyable dive, so plan your descent carefully. It’s not about huge pelagics, but about the atmosphere and the details of a century-old war grave.

Location
Cornwall & Devon, United Kingdom, Mediterranean & Europe
Coordinates
50.622000, -0.687283
Type
wreck
Maximum Depth
29m

Marine Protected Area: Offshore Overfalls

Best Time to Dive in Cornwall & Devon

The warmest water temperatures in Cornwall & Devon occur in January, averaging 9.6°C. The coolest conditions are in December at 9.6°C.

Monthly Water Temperatures

  • January: 9.6°C (air: 7.3°C)
  • February: 9.6°C (air: 8.4°C)
  • March: 9.6°C (air: 8.6°C)
  • April: 9.6°C (air: 10.1°C)
  • May: 9.6°C (air: 12.6°C)
  • June: 9.6°C (air: 15.2°C)
  • July: 9.6°C (air: 16.6°C)
  • August: 9.6°C (air: 17.1°C)
  • September: 9.6°C (air: 15.9°C)
  • October: 9.6°C (air: 13.5°C)
  • November: 9.6°C (air: 10.7°C)
  • December: 9.6°C (air: 8.7°C)

Nearby Dive Sites in Cornwall & Devon

Nearest Dive Centres to HMS SAPPER

Marine Life in Cornwall & Devon

Home to 192 recorded species including 93 reef fish, 18 sharks & rays, 13 whales & dolphins, 11 crabs & lobsters, 11 other, 10 seagrass & algae.

Notable Species

Recommended Packing List for HMS SAPPER

Based on average water temperature of 9.6°C.

  • Drysuit - water at 10°C demands a drysuit with thermal undergarments
  • Hood & Gloves (7mm+) - critical to prevent heat loss
  • Mask - essential for every dive
  • Fins
  • BCD - buoyancy compensator
  • Regulator - your most safety-critical piece of gear
  • Dive Computer - tracks depth, time, and NDL
  • Surface Marker Buoy (SMB) - essential for boat pickups
  • Dive Torch - useful for crevices and colour at depth
  • Underwater Camera - capture your diving memories