This underwater archaeologist teeters on his knees as he stares into another world.

The lost city of Thonis-Heracleion was discovered at the turn of the millennium. The wonders and knowledge it gave us have been insurmountable.

It was once a thriving hub of religion, culture and trade but Thonis-Heracleion soon feels victim to rising sea levels. A series of earthquakes, tsunamis and gradual degradation of the land was its downfall.

Franck Goddio, the discoverer of Heracleion and diver in the picture is looking into another world. The world inside the stone doorway is one of myth and legend.

There is much more out there for us to discover. We just have to look in the right places.