It's been four days since Michael Burham busted out of prison, sparking an urgent manhunt through the dense forests of Warren County, Pennsylvania.
Authorities have yet to apprehend the convicted arsonist and burglar, who is also set to stand trial for charges of murder and rape.
But how has Burham — who has been deemed a "survivalist after search parties found stockpiles and campsites — been able to evade the authorities for so long? And what can they do to catch him?
