Ferocious dogs and a detachment of military guards would stand guard, watching over the waters to ensure no convicts escaped from Port Arthur.
It was a vital link in the security system which operated throughout the Tasman and Forestier Peninsulas during the 1800s.
Three lucky criminals made it past the line … hundreds didn’t.
The line was at Eaglehawk Neck, a narrow isthmus connecting the Tasman Peninsula to mainland Tasmania and the area today is a popular holiday destination with stunning beauty.
The isthmus itself is around 400 metres long and almost 30 metres wide at its most narrow point.
The dogs would stand guard, chained to posts across the neck, to warn of any attempted escapes.
The area is filled with beautiful, rugged terrain and some stunning natural wonders, including Tasman’s Arch, the Blowhole and the Devil’s Kitchen.
The Tessellated Pavement, which you can see in one of the photos below, was formed by erosion, with the rock fractured into polygonal blocks that resemble tiles. The cracks were formed when the rock fractured through stress on the Earth’s crust mixed with the action of sands and waves.