We aquanauts lived in underwater houses for long periods
An underwater bus took us to work.
We collected fish spawn and hatched it in underwater research laboratories.
We then transplanted the hatchlings to biotrons. In addition wild young fish were lured by bait put out by divers. The fish grew until large enough to be pumped through pipes into cages.
They were fed here with synthetic food until reaching edible size. Then they were sucked into tanks, ready for hoisting to the surface by cranes, and shipping on to market. Alternatively fish were stored in massive corrals, with walls of air bubbles rising from perforated pipes.
Large fish were caught by submarine trawlers.
A robot seaweed harvester roamed the seabed pastures.
A diver with a power propulsion unit directed operations by radio. This was also done from deep-sea research submarines.
Machinery was driven by nuclear power, from underwater atomic power stations.
Atomic reactors produced respiratory gases for divers to breathe, and also heated the seabed water, causing it to rise, and bring nutrients to surface plankton. This was harvested by ships as fodder for fish farms.
Metals such as manganese collected on the seabed. Powerful magnets harvested these mineral ores. Mineral-rich silt was vacuumed up by huge machines, and pumped to the surface for refining. Underwater oilrigs extracted crude oil and pumped it up to surface tankers.
