Explorers dive for ocean treasure

Exploring shipwrecks and buried treasure isn't just reserved for Tintin. In the real world our oceans hold about 3 million sunken wrecks.

Treasure hunters have been diving and sending robots into the ocean to explore them for years.

Whilst wrecks might be a pirates paradise, some people feel they should be better protected out of respect for the dead and to help preserve history.

Ten years ago an international deal was made to look after underwater sites that are more than 100 years old.