Walk into any national museum, in any part of the world, and you will see artifacts of significance – from coins and jewellery, to weapons, utensils, artwork, clothing, and even human remains. They are preserved because these objects tell us something about who we are and where we came from.

But what if there is an artifact that is tens, or even hundreds, of meters underwater? How do we protect it from deterioration?

Joining Jonathan to discuss this is Dr. David Gregory, Senior Researcher and Honorary Professor from the National Museum of Denmark.