What are the unknown occupations in the world?

a bicycle fisherman. The Netherlands has the largest number of bicycles per capita in the world, with an average of 1.3 bicycles per person. Under the canals in Amsterdam, 12, to 15, bicycles can be salvaged every year. There is a local company called Waternet, which specializes in water area cleaning. They have been doing this work since 196s. When salvaging, one person is responsible for driving the salvage boat, another person is responsible for manipulating the mechanical claws, and the salvage boat also drags a barge to hold the salvaged bicycles.