A recent post by Jeffrey Pearce in this topic has been moved to The Islands: Expeditions, Facts, Castaway, Finds and Environs (http://tighar.org/smf/index.php?board=18.0), and renamed to "Organic Growth on Reef".
http://tighar.org/smf/index.php?topic=1315.0 (http://tighar.org/smf/index.php?topic=1315.0)