On 14 May 1940, the BBC announced that the Admiralty requested all owners of self-propelled craft between 30 and 100 feet in length to submit details within fourteen days for potential requisition. This directive was effectively an order, and by 26 May, most vessels had been called into service.

During the Dunkirk evacuation, Nydia ferried troops from the beach to larger vessels offshore and returned filled with British and French soldiers. For the remainder of the war, she was stationed at Chatham Dockyard.

Following the war, Nydia was extensively cruised by various owners, primarily on the French canals. She was eventually sunk after being struck on the Canal du Midi. Although salvaged, her then-owner, Mr Peter Cherry, was unable to carry out the necessary repairs. Subsequently, she was taken to Simon Evans' yard at Sens.

The D.L.S. Restoration Trust later acquired Nydia and transported her on a low loader to Marchwood, Hampshire. However, due to other commitments, the Trust was unable to complete her restoration. The vessel was then moved to the Wheatcroft Collection in Leicestershire.

In 2014, an enquiry regarding Nydia was made to Jerry Lewis of the Restoration Trust. Her new custodians relocated her to Surrey, where she is undergoing a comprehensive restoration with the aim of participating in the 2020 return to Dunkirk.

A hull survey conducted on 25 November 2014 at the Wheatcroft Collection, Arnesby, Leicestershire, reported that Nydia remained salvageable, with her centreline structure still serviceable. The survey noted that restoration would be an extensive undertaking, initially focusing on returning the hull to a stable and watertight condition. Subsequent phases would include installing the engine and associated systems, plumbing and tanks, electrical installations, and interior fitting. Upon completion, Nydia is expected to be a fine vessel with a distinguished history, though the restoration will require significant time, effort, and financial investment.