Mourning Loomis Reef - the heart of the Great Barrier Reef's coral bleaching disaster

Corals on Loomis Reef are dying as one veteran scientist lets the "veil" of academia drop to reveal anger and frustration

Stretching for half a kilometre or so, Loomis Reef is the place where the alarm bells started going off.

Prof Justin Marshall has been diving this reef, about 270km north of Cairns, for 30 years. Right now he is, to say the least, angry.