The murky waters of Lake Burley Griffin are iconic in the nation’s capital.

The greeny blue shades that lap the edge of the bridge-to-bridge walk are often home to many boats, birds, and every now and then a hover board.

However, we’ve all wondered, what is lurking below the surface?

Is it simply fish and rocks and algae, or perhaps something a little more sinister?

Hit 104.7’s Wilko & Courts found an online chat revealing some historic facts about what might be sitting beneath the surface.

Find out what’s hidden beneath the depths…