SS Lake Illawarra mapped in 3D as government prepares to upgrade Tasman Bridge

While many Tasmanians have heard the story, some people may not realise an important piece of history is lying next to the Tasman Bridge as they travel between Hobart's eastern and western shores. 

The SS Lake Illawarra sits at the bottom of the River Derwent after it crashed into several pylons of the bridge on Sunday 5 January, 1975, killing 12 people.

While the 140 metre-long bulk carrier is popular among divers, it is hard for most of us to imagine what the wreck of the Lake Illawarra looks like