Do you know what a database is? It's a big computer program that helps us organize and keep track of lots and lots of information.
Now, imagine that there are many old and important things like ships, planes and artifacts hiding underwater in places like Australia and New Zealand. These things are part of their history and are very valuable.
The Australasian Underwater Cultural Heritage Database is a big computer program that helps us keep track of all these important things that are found underwater in Australia and New Zealand.
So, if someone discovers an old ship or plane underwater, they would report it to a special team who would then put all the information about it into the database. That way, if someone else wants to find out about it later or learn more about it, they can just use the database to find what they're looking for.
This helps everyone learn more about these important things that are deep underwater and keep them safe for future generations.