Oresund and North Zealand

Helsingor Municipality explicitly identifies possible strong currents at Trykkerdammen; local profiles also flag pollution after heavy rain. Check DMI's Sound forecast and municipality alerts on the day. For boat and wreck scuba, require a current-specific briefing, planned maximum depth, gas reserve, buddy procedure, descent/ascent, surface signaling, rescue and abort route. Keep clear of shipping and ferry approaches, respect authorized entry and diver signaling requirements. No uncertified visitor should join a certified guided dive; the operator provides a separate try-dive product. For freediving, a trained rescue buddy and independent approval of the site are mandatory; no certified local freedive program was verified. Do not enter overhead wreck spaces without proper training, local permissions and support.

Denmark's 112 emergency service dispatches urgent assistance; report a diving injury and suspected decompression illness explicitly. Rigshospitalet in Copenhagen is the national hyperbaric treatment service for decompression illness. Its guidance lists JRCC +45 72 85 03 80 for round-the-clock specialist consultation, but emergency callers should still start with 112 rather than self-arranging chamber transport. For non-life-threatening urgent care in the Capital Region, including North Zealand, use 1813 according to its hours. Ensure tour staff know oxygen provision, evacuation handover and where everyone is located.

Danish authorities confirm the Oresund marine nature national park framework from February 2026, including stricter protected cores, a ban on bottom-towed fishing gear and marine habitat restoration. The Sound's eelgrass beds, stones, mussels and sandy seabed are living habitats, not objects to collect. Avoid touching or kicking vegetation, picking up animals or disturbing coastal bird and seal habitat. Respect temporary area rules and local conservation notices; park designation alone does not mean any specific pier, harbor, wreck or habitat is open to unrestricted dives. The Aquarium's managed Water Laboratory asks visitors to handle animals gently and return them after observation.