For the most part, the early practical work is done in the city, in a swimming pool, with the open water elements done in the sea.
Two of the most experienced outfits are Planet Scuba in Bangsar, and Scuba Dynamics, in Desa Sri Hartamas.
For more operators, have a look at the Dive Courses KL website (http://www.dive-courses-kl.com).
2A Jalan Telawi 5, Bangsar, Kuala Lumpur
T: (03) 2287 3507
Lot 32-2, 2nd Floor, Jalan 27/70A, Desa Sri Hartamas, Kuala Lumpur
T: (03) 2300 1489