HMS Coriolanus (Wreck)
Divers can expect to encounter impressive schools of sardines, graceful long Conger eels, majestic lobsters, elusive scorpions, dazzling gilt-head breams, vibrant flying gurnards, and fascinating Flabelinas. If fortune smiles upon you, you might even catch a glimpse of the magnificent Eagle ray.
HMS Coriolanus, a British Royal Navy warship of the Shakespeare class, served as a minesweeper. Its specifications include a length of 46 meters (150 feet), width of 8.5 meters (28 feet), and an armament of 1 cannon (12 pdr) and 3 MK (20 mm). Launched on September 2nd, 1940, the ship met its fate on May 5th, 1945, sinking within minutes after striking a naval mine.
Named after the esteemed actor Gnej Marcije Koriolan (Gnaeus Marcius Coriolanus) from a theatrical piece, HMS Coriolanus played a role beyond warfare and espionage, reportedly being utilized to intercept Yugoslav radio transmissions. The ship participated in significant Allied naval operations, including Operation TORCH, the North Africa landing in 1942, and Operation HUSKY, the Sicily landing in January 1945.
Resting upright on the seabed at coordinates N 45°19´09´´ / E 13°25´25´´, approximately 6 nautical miles from the coast of Novi Grad and 11 nautical miles from our dive center in Umag, HMS Coriolanus lies at a depth of 20 to 28 meters. Remarkably well-preserved, this wreck offers an excellent diving opportunity for divers with basic experience in wreck diving. It is recommended that divers possess at least an Advanced Adventures certification or higher to fully enjoy this underwater marvel.
The visibility at the dive site is approximately 11 meters, and the maximum depth reaches 27 meters. With its combination of historical significance and captivating marine life, diving at HMS Coriolanus is an unforgettable experience. Close to Grad Poreč in Istria County, Croatia, this remarkable dive site beckons advanced and expert divers to embark on an extraordinary underwater adventure.
Diving Conditions Score for HMS Coriolanus (Wreck)
Very good diving conditions!
The score is based on a calculation of the current weather and sea conditions.
Dive Site Overview for HMS Coriolanus (Wreck)
Depth
27m
Visibility
11m
Experience Level
Weather Conditions for HMS Coriolanus (Wreck)
Wave Height
0.22m
Wind Speed
36.8 m/s
Water Temp
26.2°C
Visibility
40.2km
Cloud Cover
100%
Wave Period
2.4s
Air Temperature
25.5°C
Precipitation
0 mm
Dive Score Chart for HMS Coriolanus (Wreck)
Best time to dive: 16:00 with score 9.048412698412701/10. Water conditions: Waves 0.2m, Wind 3.9 m/s.Best night dive time: 0:00 with score 8.077619047619049/10.
Chart showing hourly dive conditions including wave height, wind speed, water temperature, and visibility throughout the day.
Optimal diving conditions at HMS Coriolanus (Wreck) are affected by daylight hours. Sunrise occurs at 06:00 and sunset at 18:00, which impacts visibility and water temperature for scuba diving and snorkeling.
Score: 9.0/10
Waves: 0.2m (2.1s), Wind: 3.9 m/s
Score: 8.1/10
Waves: 0.04m, Wind: 48 m/s
Seasonal Analysis for HMS Coriolanus (Wreck)Alpha
Historical patterns and best seasons for diving at HMS Coriolanus (Wreck)
The dive score combines all factors to rate overall diving conditions throughout the year. Higher scores indicate better diving conditions.
Monthly Dive Score Analysis - Seasonal Diving Conditions
Higher values indicate better diving conditions
Seasonal DiveScore Chart
This chart displays monthly diveScore data throughout the year, showing seasonal patterns. The data is presented as a bar chart with an overlaid line graph.Dive scores range from 1 to 10, with 10 being optimal conditions.
Higher values indicate better diving conditions
Best Season for HMS Coriolanus (Wreck)
Winter
Winter offers the best overall diving conditions with calmer seas and better visibility, despite cooler temperatures.
Best Months for HMS Coriolanus (Wreck)
Ideal Conditions for HMS Coriolanus (Wreck)
Water Temp
24.5°C / 76.1°F
June
Visibility
20.1m / 65.9ft
October
Wave Height
0.2m / 0.7ft
January
Wave Period
8.0s
January
Seasonal Insights for HMS Coriolanus (Wreck)
HMS Coriolanus (Wreck) shows typical northern hemisphere patterns with June being the warmest month (24.5°C) and December the coldest (20.5°C). The calmest conditions typically occur in January with average wave heights of 0.2m and wave periods of 8.0s. The most comfortable wave conditions are in January with a low wave steepness ratio, creating gentler swells. January offers the longest wave periods (8.0s), creating more comfortable and predictable conditions for boat entries and exits. Ocean currents are slowest in January (0.5m/s) and strongest in January (0.5m/s). January is usually the driest month with 0.0mm of precipitation. For beginners, the best time to visit would be during January to March, when ocean conditions are calmer with long-period waves and currents are typically weaker. Experienced divers might enjoy the challenges and potentially better visibility during the shoulder seasons, with moderate currents that can improve marine life encounters.
Last updated: 1 min. ago - Jun 22, 2026