Mainly, they die. Very high attrition rate. Watching turtle egg laying at Mon Repos Beach near Bundaberg is fantastic. I'd love to see the hatching as well. (Leatherbacks, loggerheads and green turtles there)
Good news recently too, this season (2024/2025) has seen a record-breaking number of eggs being laid in Mon Repos[3]. Highly recommend anyone goes visit, pretty special.
1: https://parks.desi.qld.gov.au/__data/assets/pdf_file/0019/16... 2: https://seaturtlealliance.org.au/loggerhead/ 3: https://www.abc.net.au/news/2025-02-05/endangered-turtles-br...