Royal Navy Submarine K26

In 1920, Chatham witnessed the completion of an enhanced submarine design that was finalised in June 1923.

This improved model incorporated modifications from previous iterations, resulting in a reduction of surface speed compared to its predecessors. Notably, the bow of K26 and hydroplanes underwent alterations, and the torpedo tube capacity was increased. The superstructure was also modified to offer improved protection, addressing the issue of water ingress through the funnels.

K26 boasted a larger fuel oil capacity, enabling her to achieve a greater range despite her larger displacement. She also had enhanced ballast tank arrangements which facilitated faster diving and allowed for increased maximum diving depth.

Royal Navy Submarine K26

In 1924, K26 embarked on a voyage that attracted public attention, sailing via Gibraltar, Malta, and the Suez Canal to Colombo and Singapore, before returning to the UK.

However, and due to a breach of the displacement limits outlined in the London Naval Treaty, K26 was subsequently decommissioned and dismantled in April 1931.

Notably, this steam-powered submarine held the distinction of being the last of its kind until the launch of the first nuclear-powered submarine, USS Nautilus (SSN-571), in 1954.