HMS MARSONA (S SECTION) - Scapa Flow, Orkney

If you're diving Scapa Flow, the HMS *Marsona* (S Section) is a quirky little wreck that often gets overlooked, but we always try to squeeze in a dive here. Sitting upright in 16 metres, she's a trawler converted into a minesweeper, sunk in 1940. We love her compact size – it means you can explore the whole thing without feeling rushed by the cold. The bow section is our favourite, with the hawse pipes and anchor chains still clearly visible. You’ll often find conger eels peering out from gaps in the plating, their thick bodies blending into the shadows. Visibility here can be surprisingly good, especially on a slack tide, letting you appreciate the details of the triple-expansion engine. Look for the colourful jewel anemones clinging to the darker recesses, and the occasional inquisitive wrasse darting around the propeller shaft. It’s an accessible wreck, perfect for an afternoon dive, particularly if you're keen on seeing a well-preserved piece of maritime history colonised by the Flow's resilient marine life.

Location
Scapa Flow, Orkney, United Kingdom, Mediterranean & Europe
Coordinates
57.673317, -3.917800
Type
wreck
Maximum Depth
16m

Marine Protected Area: Moray Firth

Best Time to Dive in Scapa Flow, Orkney

The warmest water temperatures in Scapa Flow, Orkney occur in January, averaging 8.4°C. The coolest conditions are in December at 8.4°C.

Monthly Water Temperatures

  • January: 8.4°C (air: 5.5°C)
  • February: 8.4°C (air: 5.3°C)
  • March: 8.4°C (air: 5.9°C)
  • April: 8.4°C (air: 6.8°C)
  • May: 8.4°C (air: 9.7°C)
  • June: 8.4°C (air: 12.4°C)
  • July: 8.4°C (air: 13.2°C)
  • August: 8.4°C (air: 13.7°C)
  • September: 8.4°C (air: 12.7°C)
  • October: 8.4°C (air: 10.2°C)
  • November: 8.4°C (air: 8.0°C)
  • December: 8.4°C (air: 5.8°C)

Nearby Dive Sites in Scapa Flow, Orkney

Nearest Dive Centres to HMS MARSONA (S SECTION)

Marine Life in Scapa Flow, Orkney

Home to 155 recorded species including 63 reef fish, 17 whales & dolphins, 12 sharks & rays, 11 crabs & lobsters, 11 other, 10 seagrass & algae.

Notable Species

Recommended Packing List for HMS MARSONA (S SECTION)

Based on average water temperature of 8.4°C.

  • Drysuit - water at 8°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

Frequently Asked Questions

What is the maximum depth of the HMS MARSONA (S SECTION) dive site?
The HMS MARSONA (S SECTION) dive site has a maximum depth of 16 meters. This makes it an accessible wreck for many recreational divers looking to explore the historic waters of Scapa Flow.
What kind of marine life and wreck features can divers expect to see at HMS MARSONA (S SECTION)?
Divers exploring the HMS MARSONA (S SECTION) can expect to encounter the remains of a 38.2m x 7.1m trawler vessel, which was converted into a minesweeper. Notable features include its single triple boiler. While specific marine life isn't detailed, wrecks in Scapa Flow often become artificial reefs, attracting various local species.
How challenging is the dive at HMS MARSONA (S SECTION) for recreational divers?
The HMS MARSONA (S SECTION) is classified as an intermediate difficulty dive. It is also noted as a "Dangerous wreck," indicating that divers should approach it with caution and appropriate training. This classification suggests that while it's not for beginners, experienced recreational divers can enjoy exploring this historic site.
What are the best months or seasons to dive the HMS MARSONA (S SECTION) for optimal conditions?
The provided data does not specify the best months or seasons for optimal diving conditions at the HMS MARSONA (S SECTION). For up-to-date information on seasonal conditions, we recommend consulting local dive operators in Scapa Flow or checking our When to Dive guide.
What diving certifications are required to explore the HMS MARSONA (S SECTION) wreck?
Given that the HMS MARSONA (S SECTION) is an intermediate difficulty dive and classified as a "Dangerous wreck," divers should possess at least an Advanced Open Water certification or equivalent. For exploring wreck interiors, specialized wreck diving training is highly recommended to ensure safety and proper technique.
What are the typical current conditions and visibility like at the HMS MARSONA (S SECTION) dive site?
The provided data does not include specific details regarding typical current conditions or visibility at the HMS MARSONA (S SECTION) dive site. Divers planning to visit should consult local dive centers in Scapa Flow for the most current information on these environmental factors.