I recently spoke with Simon Walsh of Nature Island Dive about an aggressive disease attacking coral throughout the Caribbean:  Stony Coral Tissue Loss Disease (SCTLD).  This disease destroys the soft tissue of at least 23 species of reef-building corals, killing them within weeks or months of becoming infected. Due to its rapid spread, high mortality rate, and lack of subsidence, it has been regarded as the deadliest coral disease ever recorded.