Professional deep-sea diver Adrian Corrigall and his wife Megan plan to build their new family home in rural East Sussex almost entirely out of concrete, with construction involving cutting-edge technologies conceived in Switzerland and never used to build a house before. However, the perils of being a pioneer soon become evident, and with both schedule and budget under strain, Adrian is forced to resume work as a diver, taking him away from the project for a month at a time.