Lieutenant Commander Sam Edgar, a marine engineer and submariner with a distinguished naval career spanning three decades, died peacefully in his sleep on May 18, 2026, at the age of 88. Born in Richhill, County Armagh, on November 18, 1937, Edgar joined the Royal Navy as a teenager in 1956, dedicating his life to maritime service.

Edgar’s early naval years included service aboard the Swan-class sloop HMS Opossum and later in the Oberon-class submarine also named Opossum. His submarine career expanded through service on vessels such as HMS Narwhal, Odin, Olympus, and Sealion, as well as the Canadian submarine HMCS Okanagan. In 1964, he formally joined the submarine service—known colloquially as “the Trade”—and qualified as a mechanician by 1966. Promoted to commissioned officer in 1971, he transitioned from diesel engines and battery power to the complexities of steam when assigned to the aircraft carrier HMS Eagle.

One of the defining moments of Edgar’s career occurred while on watch in the machinery control room aboard Eagle in 1971, south of the Sunda Strait en route to Australia. A fire broke out in the ship’s liquid oxygen (LOX) plant, a particularly hazardous compartment, leading to an intense and prolonged battle to contain the blaze. The fire caused three oxygen bottles to burst into flames, threatening catastrophic damage. Thanks to rapid response from engineers and damage control teams, along with the strategic location of the LOX plant and the use of cold seawater to cool the bulkheads, the fire was brought under control by midnight, and the ship remained operational. Edgar later recalled the harrowing scene, describing the stench of burning materials and the tension over the risk of explosions.

Throughout his career, Edgar held various shore postings, including assignments in Halifax, Nova Scotia; Faslane; Portsmouth; Gosport; and Bath. He was commissioned as a marine engineering lieutenant in 1973 and recognised with an MBE in 1987 for his service. In 1982, as a lieutenant commander and submarine drafting officer at HMS Centurion in Gosport, Edgar commanded the royal guard during Princess Anne’s visit to open a new computer facility, an occasion he valued deeply.

After retiring from active duty, Edgar worked in the civilian sector with companies such as Glasgow Reboring, Deep Sea Seals, and Astral UK. Colleagues and friends remember him for his technical skill, calm under pressure, and his characteristic dry humour.

Edgar’s life was marked by resilience through numerous challenges, including surviving a motorbike accident, cancer, a heart attack, and multiple hip surgeries. He is survived by his wife, Rita Wallace, whom he married in 1960, and their three children. His legacy endures in the naval community and among those who served alongside him.