There is definitely money to be made in this field.
Start your own business cleaning and repairing swimming pools!
Collect exotic fish for your aquarium
or sell them to pet shops
If you are skilled enough - start a business repairing drive units and sterring mechanisms on boats
Go directly to
dive unit prices
HOW TO CATCH LOBSTER
Aeration for fish pond in winter
Let the Scuba Breather work all winter by using it to aerate your fish pond for fish health and ice prevention.
Note: Scuba Breather dive unit is NOT meant to be outside in winter! This idea is meant to have the dive unit inside with breathing air pumped through piping to a pond or lake. Leave full flow for greatest electrical economy.