Van Isle
Contributor
Around here you can get a restricted occupational SCUBA cert - what some call a "light commercial" rating - for about $2000 or something. It gives you the tools you need to do exactly what you're talking about. Non-decompression, table diving, on SCUBA (not surface supplied) and working with tools. A few friends have gone through the program and it still seems "simple" jobs require a standby diver and a tender. And usually a FFM, redundant air, and a serious (like a Viking) dry suit.