Klint Havn at Hesselø is a shallow marine dive site characterised by seagrass beds. The site is suitable for beginners, with an average depth of 2 metres and a maximum depth of approximately 2.4 metres. Divers access the water directly from the shore. Conditions are generally mild, though water temperatures fluctuate significantly throughout the year, ranging from 4C in the winter months to 19C in August. Facilities available at the site include parking, toilets, and showers for diver convenience.

Grønlandshuse, located at Hesselø, Denmark, is a shallow marine dive site with depths ranging between 3 and 5 metres. The site offers a temperate environment suitable for divers, with water temperatures fluctuating significantly throughout the year, from 4C in the winter months to 19C in August. The habitat supports a variety of temperate marine life, including various reef fish and invertebrates typical of the region. Given the shallow depth, the site is accessible for divers looking for a relaxed experience in these northern waters. Conditions at this location vary, and divers should be prepared for seasonal temperature changes.

Hundested Havn near Hesselø offers shallow marine diving at depths between 3 and 4 metres. The site is suitable for divers seeking calm, shallow conditions, with water temperatures ranging from 4C in winter to 19C in August. Divers frequently encounter wrasses, snails, and European green crabs among the local marine life. Less common sightings include giant jellyfish, common moon jellyfish, common sea stars, righteye flounder, shrimp, pipefish, rockpool prawns, sea squirts, and pout. Given the shallow depth, the site is accessible for beginners and provides opportunities for both diving and snorkelling in a sheltered harbour environment.

Hajen is an artificial reef located off Hesselø, Denmark, providing a shallow, sheltered environment suitable for beginner divers. As an artificial structure, it offers a controlled introduction to cold-water diving, though conditions such as depth and visibility are variable. Divers should be prepared for water temperatures ranging from 4C in winter to 19C in summer, necessitating appropriate thermal protection. Entry is via the shore, where divers should shuffle their feet to avoid sea urchins. Hazards include boat traffic, requiring the use of a surface marker buoy, as well as potential entanglement in kelp forests and strong currents. Always monitor local conditions before planning a dive.

The Libra M/S is a shipwreck dive site located off the coast of Hesselø, Denmark. The wreck lies at a consistent depth of approximately 10 metres. Conditions at this site vary throughout the year, with water temperatures ranging from 4C in the winter months to 18C in August. The site is suitable for divers interested in wreck exploration within a temperate marine environment. The habitat supports a variety of temperate marine life, including various reef fish and invertebrates typical of the region. Divers should be prepared for variable visibility and conditions common to the Danish coastline.

Anders Martin is a wreck dive located off Hesselø, Denmark, resting at depths between 16 and 23 metres. Divers can expect visibility ranging from 10 to 15 metres, providing a clear view of the structure. The site is accessible only by boat and is suited for intermediate divers due to the need for active current management. Water temperatures are cold, fluctuating between 4 and 14 degrees Celsius, necessitating appropriate exposure protection. The habitat supports a variety of temperate marine life, including various fish and invertebrates typical of the region. Divers should monitor their depth closely throughout the 45-minute average dive time to manage nitrogen levels.

Sjaellands Oeje is a shore-entry reef and kelp forest site located 100 metres from the coast of Hesselø. Divers can explore depths ranging from 6 to 15 metres, with visibility typically between 5 and 10 metres. The site features a mild current, though surge and swell conditions can vary. Due to water temperatures fluctuating between 4 and 16 degrees Celsius, a drysuit or thick wetsuit is recommended. The area is suitable for beginners and supports night diving. Divers should remain aware of active boat traffic in the vicinity. Parking is available at the site, and it is advised to suit up fully before walking to the water.

Hesselø is a reef site located in the Kattegat, requiring boat access due to its position 30 kilometres from the shore. The site is suitable for beginners, offering a shallow depth range of 2 to 5 metres. Divers should be prepared for cold water conditions, which vary significantly throughout the year, ranging from 4°C in winter to 19°C in August. Currents at the site are generally mild. Given the exposed nature of the location and the cold water temperatures, appropriate thermal protection is essential for all dives.