In the early hours of a January day, the British submarine HMS Truculent was conducting routine exercises in the Thames Estuary when it collided with the MV Daghestan, an oil tanker navigating nearby waters. The accident was attributed primarily to poor visibility and the challenging maritime conditions of the estuary, which can often pose hazards to vessels. As a result of the collision, HMS Truculent sustained severe damage to its hull that led to a swift loss of stability. Within moments, the submarine began to sink, and panic ensued among the crew, who scrambled to don their escape gear. Unfortunately, the rapid inundation made escape nearly impossible for many.Rescue operations were launched swiftly, with nearby vessels and Royal Navy personnel aiding in the frantic search for survivors. Despite their efforts, the tragedy culminated in the loss of 64 men, a devastating blow to the submarine's crew and the Royal Navy. The incident raised urgent questions about naval safety practices, leading to scrutiny over training protocols and navigational systems used by submarines in congested waters. The collision marked a pivotal moment in British naval history, spotlighting the need for enhanced safety measures in both civilian and military maritime operations.