# HNLMS Den Helder

HNLMS Den Helder is a new replenishment oiler of the Royal Netherlands Navy. Also known as the Combat Support Ship (CSS), Den Helder is planned to fill the gap of replenishment at sea that was left after HNLMS Amsterdam was sold to Peru in 2014. The design is based on the Karel Doorman.

## History

The sale of HNLMS Amsterdam in 2014 left a gap in the navy's ability to replenish its own ships and those of allies. The successor of HNLMS Zuiderkruis, HNLMS Karel Doorman, was not capable enough as it was not built as a full-fledged replenishment oiler. In 2017 a study started to look at the possibility of a new tanker to fulfill this task.
In 2019 the so called D-letter, the final process before the contract can be signed, was sent to the Tweede Kamer for approval. With the contract signing following two months later on the bridge of HNLMS Karel Doorman. During Prinsjesdag in 2022 it was announced that the Den Helder would be equipped with a close-in weapon system (CIWS), which later was confirmed to be the same CIWS that will be installed on the Anti-Submarine Warfare Frigate and the HNLMS Karel Doorman. A year later, in 2023, it was reported that the Den Helder will not be equipped with several systems for self defense that were previously planned as a result of austerity measures.
The ship carries two 40-ton cranes and can carry up to 24 sea containers. It can dispense 7,600 cubic metres (2,000,000 US gal; 1,700,000 imp gal; 7,600,000 L) of diesel (including for its own use), 1,000 m$^3$ (260,000 US gal; 220,000 imp gal; 1,000,000 L) of helicopter fuel (including for its own use), 226 m$^3$ (60,000 US gal; 50,000 imp gal; 226,000 L) of drinking water and 434 tons of other goods, including ammunition. The vessel can accommodate up to two NH90 NFH helicopters or, alternatively, one NH90 NFH and two UAVs. It carries two LCVPs (Landing Craft Vehicle Personnel) and 2 FRISC (Fast Raiding Intercepting Special Forces Craft). The ship's infirmary operates as a Role 2 hospital (providing limited hospital capability, including surgery). The radios aboard the Den Helder are made by Rohde & Schwarz Benelux.

### Naming

The name was revealed in a ceremony in honor of the 10.000th ship model, which was the new CSS, made at MARIN. In attendance were the Commander of the Royal Netherlands Navy: Rob Kramer, the State Secretary for Defence: Barbara Visser, the State Secretary for Economic Affairs and Climate Policy: Mona Keijzer and the CEO of Damen Schelde Naval Shipbuilding.
It is the first time a vessel is named after the city of Den Helder, which is home to the Netherlands main naval base.

### Construction

The first steel was cut in a ceremony on 2 December 2020 at the Damen yard in Galați. On 2 June Damen Shipyards Galați has performed the keel-laying ceremony on the Combat Support Ship (CSS) Den Helder. The keel-laying ceremony was performed by the Director Defence Material Organisation (DMO), vice admiral Arie Jan de Waard and vice admiral Rob Kramer, Commander Royal Netherlands Navy (RNLN). The ship was formally laid down on 2 June 2021. The first major section, measuring 90 m (300 ft), of the new vessel was launched in Galați on 11 April 2022. The assembled ship was floated and moved to another part of the building dock in October 2022 with work expected to continue through 2023. Sea trials are anticipated in early 2024.
In October 2023 it was reported that Damen had delivered a virtual reality version of HNLMS Den Helder to Command Materiel and IT (COMMIT), which can be used to train the new crew. The same month the diesel generators were started for the first time aboard the ship. In October 2023 DXC delivered GDIT's VirtualShip version of Den Helder for bridge crew training at Nieuwe Haven.
On 16 November 2024 the Den Helder left Damen Shipyards Galați and began its journey to the Netherlands, where the ship will be fitted out. During its journey to the Netherlands the ship will perform its sea trials. These sea trials were initially planned to be done in the Black Sea, but because of Russo-Ukrainian War it was instead decided to do this during the journey from the Galați shipyard to the Netherlands. After arriving in the Netherlands the ship will be fitted out at Damen facilities in Vlissingen and Den Helder. On 12 December 2024 Den Helder docked briefly at Den Helder to pickup equipment and goods that are needed for the completion of the ship. The next day, on 13 December, Den Helder arrived at the Damen Naval shipyard in Vlissingen to complete its final outfitting ahead of delivery. The ship is planned to be delivered to COMMIT in spring 2025. On 22 February 2025 Den Helder was christened by Princess Amalia. It is expected that the ship will be fully operational in October 2025.

## Similar ships

* Aotearoa class
* Protecteur class
* Supply class
* Tide class
* Vulcano class