As
@matts1w mentioned there is no diving within 30min of the airport. You may find dive center that advertises close to the airport but that is just there office location, they will drive couple hours to the NE end of Bali.
Just to give you and idea here is a map of Bali:
Blue is the airport
Yellow is aprox. 30min drive from airport if there is no traffic could double that if there is traffic if your in a car. Scooter is the best to get around
Red are the main tourist dive sport, there are lots others on the North end as well and between PB and Amed
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