Many professional dive operators required Cave Dive Certification for diving in cave. Unfortunately, significant number of dive operators in S.E. Asia do not insist on such requirements e.g. almost all dive operators in Caron do not require divers to have Wreck Dive certification when going to WWII ship wreck. This explains why some divers starts to move turtle 🐢 skeleton remains, collecting wreck remains, etc. .... including touching the silt as shown in this video ... and unable to differentiate silt from Ash
