With the advent of Sea Colonies, it became necessary to design a way of working underwater for people who were not genetically engineered for this. Liquid Breathing was tricky to achieve, but it mostly solved the problem with a new type of suit, where the aquanaut was breathing a special fluid instead of air. Liquid Breathing greatly diminished problems with pressure-related illnesses. With time, even the Sea Colonies themselves became filled with the breathing fluid, changing their architecture and the lives of their inhabitants forever.