Diving atAmmoniakhavnen (Denmark)
Ammoniakhavnen offers a distinct diving landscape in Denmark, characterized by its historical industrial backdrop and varied underwater topography. This site, once an active ammonia port, draws divers keen on exploring artificial structures now colonized by marine life. It provides a unique blend of historical intrigue and natural exploration, easily identifiable by the two large round storage tanks visible from the Little Belt Bridge.
Tonight's objective overview for Ammoniakhavnen shows an air temperature of 6.7°C. The measured surface conditions include wave heights around 0.38m. This environmental data is logged for the close of the day.
Dive Site Coordinates
55.5244, 9.7412
Dive Site Characteristics
Key Dive Site Facts
Dive Site Overview
Emerging from its past as a busy industrial port, Ammoniakhavnen has transformed into a compelling dive site where the remnants of its history now form part of the underwater ecosystem. Ships historically unloaded ammonia here, lending the area its name, but today the port serves divers and anglers.
The underwater landscape transitions from an initial eelgrass belt to a distinct slope, giving way to mixed brown algae beds and mussel banks. A notable feature is the old bulwark, descending to around the 12-meter mark, beneath which lies an overgrown steel mesh designed to prevent propeller scour. Dives here can extend deeper, reaching up to 42 meters / 137 feet in certain areas, though average dive depths tend to be shallower, often around 16 to 22 meters / 52 to 72 feet. This site is popular for drift, night, and wall dives.
Best Time to Dive
For a more comfortable and visually rewarding experience at Ammoniakhavnen, planning your dive between May and September is often recommended. During these months, surface air temperatures average a warmer 13-17°C / 55-63°F, with water temperatures ranging from 10-17°C / 50-63°F. While good conditions are reported year-round, earlier spring months like April see air temperatures around 8-10°C / 46-50°F and water temperatures between 6-7°C / 43-45°F, which might appeal to cold-water enthusiasts. Rainfall is generally moderate throughout the year, typically around 1.5-3.5 mm per day, meaning precipitation is unlikely to be a major deterrent for dive planning. Optimal visibility, ranging from 10-25 meters / 33-82 feet, is inconsistently reported but tends to be better during calmer periods.
Climate Historical Averages
Monthly records compiled from satellite and marine observation nodes over the last 3 years. Data provided by Open-Meteo and MET Norway.
Dive Experience & Conditions
Divers often begin their exploration of Ammoniakhavnen with a shore entry, navigating a distinct sequence of underwater environments. After traversing an initial eelgrass belt, the terrain slopes down, quickly revealing sections of mixed brown algae and extensive mussel banks. The old bulwark offers a significant structural element to explore, with depths near it dropping to around 12 meters. Beyond this, a heavily overgrown steel mesh creates an intriguing habitat. Strong currents, ranging from 1-4 knots, are a common characteristic of this site, especially in certain areas, which supports the drift diving opportunities and contributes to the biodiversity. Water temperatures vary significantly seasonally, from 3°C / 37°F in colder months to 21°C / 70°F in summer. Visibility is highly variable, reported anywhere from 5 to 25 meters / 16 to 82 feet depending on the current and local conditions, requiring divers to adapt to changing clarity.
Dive Difficulty & Safety Guidelines
Approaching Ammoniakhavnen requires divers to be well-prepared for varying conditions, particularly the reported currents which can range from 1 to 4 knots. This necessitates good buoyancy control and navigation skills, with drift diving techniques frequently employed. Given the variable water temperatures, from 3-21°C / 37-70°F, adequate thermal protection is crucial, often calling for drysuits or thicker wetsuits. Shore entry is typical, so divers should be comfortable with beach access and carrying gear. As with any site with a dynamic environment, it's prudent for divers to carry a surface marker buoy (SMB) and a dive knife. Awareness of local boat traffic and following a planned course, such as keeping a 100° heading when swimming out into the belt, is essential.
Recommended Equipment
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Verified equipment recommendations for this dive site are being reviewed and may be added as additional source checks are completed.
Recommended Dive Suit
For dives of average duration, drysuit (strongly recommended) usually provides sufficient protection from heat loss. Consider warmer surface protection (like a boat coat) due to brisk winds. Strong cold advisory: dress warmly immediately after exiting the water.
Current readings at Ammoniakhavnen show water temperatures near 9°C (49°F). Surface air temperatures are resting at 7°C (44°F).
Environmental models indicate a modest warming trend ahead. A warming trend is expected over the next few days.
Conditions last reviewed: 18:00 using the latest environmental data.
Dive Logistics & Preparation
Hyperbaric Chamber
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Entry Requirements
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Currency
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Nearest Airports
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Marine Life at Ammoniakhavnen
The underwater landscape at Ammoniakhavnen, a mix of gravel, kelp, and sand, supports a diverse range of marine life. Currents here are a significant factor contributing to this rich ecosystem, bringing nutrients to a variety of creatures. Divers often encounter starfish and various species of crab. The site also hosts different types of fish, including cod, Goldsinny wrasse, gobies, and sculpins. Look closely among the algae and structures for nudibranchs, molluscs, and the occasional jellyfish drifting by. Lobster and hermit crabs can also be spotted, alongside other unique species like butterfish, wrasse, and toadfish.
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Frequently Asked Questions
What is the maximum depth at Ammoniakhavnen?
While average dive depths are commonly around 16 to 22 meters, the site's maximum recorded depth can reach approximately 42 meters in certain areas. Structures like the old bulwark are typically found at depths around 12 meters.
Are there strong currents at Ammoniakhavnen?
Yes, currents are a notable feature of Ammoniakhavnen, varying between 1 to 4 knots. These currents contribute to the site's biodiversity and make it suitable for drift diving, but divers should be prepared for dynamic conditions.
What kind of marine life can I expect to see?
Ammoniakhavnen is home to a variety of marine life, including starfish, crabs, jellyfish, nudibranchs, and various fish species like cod, Goldsinny wrasse, gobies, and sculpins. You might also spot lobster and hermit crabs, especially near the old bulwark and steel mesh structures.
What are the typical water temperatures?
Water temperatures at Ammoniakhavnen vary significantly with the season. They can range from approximately 3°C / 37°F in colder months up to 21°C / 70°F during the warmer summer period. Adequate thermal protection is advised.
Is Ammoniakhavnen suitable for beginner divers?
While accessible via shore entry, the variable visibility and presence of strong currents mean Ammoniakhavnen is generally more suited for divers with some experience, especially those comfortable with drift diving or more dynamic conditions. Training like PADI Open Water Diver and Advanced Open Water Diver is useful.
What types of diving are popular here?
Ammoniakhavnen is recognized for drift dives due to its currents. It's also a popular spot for night dives, offering a different perspective on the marine life, and features wall diving opportunities along the old bulwark and seabed contours.
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