Some nests are easy to get to:

some are less so ...

& others are quite difficult...

We measure the depth to the top egg:

& to the bottom to get the egg-chamber diameter

We count the eggs:

Release any live baby turtles that are still in the nest ...

& then examine any unhatched eggs or dead embryos:

Overall hatching success is high ~ about 95%

At Palmerston Atoll during the Rufford Trust Expedition (April 2012): almost 9000 eggs were examined and only 429 failed to hatch.