Those white things on the sponges are a variety of sea cucumber. Sometimes there were so many that you could barely see the sponge.

2003:09:03 19:14:38
Island: Gili Lawa Darat
Dive Site: Point of No Return
Speed: 1/30 sec
Aperture: f5.6
ISO: 100
Exposure Compensation: 0.0
Exposure Program: Aperture Priority
Focal Length: 7 mm
Flash: