Comment by nradov

Some sensitive areas have had good results with requiring tourists to dive with licensed local guides. But 45m is a little deeper than most recreational divers can safely go. To do it safely and get a reasonable bottom time takes some basic technical dive training plus double tanks with normoxic trimix, and a decompression stage. (I know many divers have gone deeper using a single tank with compressed air but if anything goes wrong it can turn deadly in seconds.)