Holm-class multi-purpose vessel

The Holm-class vessels are part of a larger Danish naval procurement program aimed at creating a modular fleet, which is achieved with the StanFlex modular mission payload system. They are built using a composite material known as a FRP (fibre-reinforced plastic) sandwich construction, which is also used in other Danish naval vessels like the Diana-class patrol vessels. This construction method reduces maintenance costs and gives the vessels a non-magnetic hull, a useful feature for mine countermeasures.

The vessels are divided into three groups of two, each designed for a specific primary role:

• Hydrographic survey vessels (Birkhom and Fyrholm): These are equipped for hydrographic surveying and are used to map Danish waters.

• Training vessels (Ertholm and Alholm): These are used for naval cadet training and carry a small complement of three crew members with lodging for up to ten trainees.

• Mine countermeasures vessels (Hirsholm and Saltholm): These vessels can operate remote-controlled mine clearance drones or serve as support vessels. Their non-magnetic hull is critical for this mission.^[2]

The multi-role nature of the Holm class is a key feature, allowing the Royal Danish Navy to optimize its fleet for various tasks without needing specialized hulls for each. They have a StanFlex flexible container position at the stern, which can be fitted with equipment for environmental protection, a crane, or stores, depending on the mission.