The scientists will cryogenically freeze the specimens for safekeeping. The Australian scientists will keep their genetic specimens at the Taronga Western Plains Zoo in New South Wales.
The cells are carefully frozen so they are suspended, but kept alive. In the future, they can be thawed and the sperm will fertilize eggs. All in the hopes future technology will develop to regrow coral colonies from the cells.
All of this is in case of a last resort to regrow corals and replace dying species in the oceans. Hopefully we will stop destroying our environment so we don't need to use this "doomsday" resource, but better knowing its there than wishing it was in retrospect.