- The story explores the scientific research and experiments conducted by a group of researchers at University College London (UCL) during World War II to address challenges in underwater survival and diving. The group, led by J.B.S. Haldane, included scientists like Helen Spurway, Elizabeth Jermyn, Hans Kalmus, Ursula Philip, and others.

- They conducted experiments in hyperbaric chambers to understand the effects of gases like oxygen and carbon dioxide at various pressures and depths. This research helped establish safety protocols and identify risks like decompression sickness.

- Scientists like Horace Cameron Wright also carried out experiments with explosive charges to understand blast injuries from underwater explosions.

- The development of midget submarines by nations like Germany, Italy, and the UK is discussed. The British X-craft submarines played an important role in reconnaissance activities.

- Operations like the Dieppe Raid highlighted shortcomings and the need for thorough beach reconnaissance and intelligence gathering. Groups like the Combined Operations Pilotage Parties (COPP) and experimental units like the Land Craft Obstruction Clearance Units (LCOCU) were formed for these purposes.

- Missions like Operation Postage Able involved COPP teams and X-craft submarines scouting beaches in Normandy in preparation for D-Day. They gathered vital intelligence while facing challenges.

- The research supported efforts like dismantling underwater obstacles and provided safety protocols for oxygen use by combat divers and submariners.

- Tensions emerged between scientific leaders like J.B.S. Haldane and others over personnel issues, but cooperation with organizations like the US Navy continued progress.

- Throughout, the story highlights the sacrifices, dangers and challenges faced by the scientists and military personnel involved in furthering the scientific understanding and capabilities needed for underwater and special operations during the war.