I think Chumpon pinacle had 35m~ bottom, not sure though, I mostly scuba'ed there or did shallow shore freediving (lack of partners and other conditions, was also looking for sights rather than depth). Nowdays I heard they got an apnea school there called apnea total, they should know where/what and probably have means of getting into sites (boats). Try contacting Monica over these forums or use the search function for other threads mentioning Thailand.
If you do intend going there I could elaborate on my specific expiriences.
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