Annual spawning sees billions of corals across the Great Barrier Reef release their eggs into the water on one night of the year. Hundreds of researchers are currently on the reef, and there's a bunch of major research projects underway to coincide with it. Most interesting is 'IVF for the Reef', an effort to reestablish degraded corals by redistributing larvae from healthy areas of reef. Before it's resettled the larvae is mixed with lab-produced symbiotic algae to boost its energy and increase its chance of survival.
https://citizensgbr.org/p/larval-restoration-project