Lincolnshire Police are searching for a man who absconded from North Sea Camp near Boston after jumping over a wall.
Peter McGlade, who is serving time for burglary, escaped at around 6.10pm on Sunday, January 7.
Officers, a police drone, dog support unit and air support have been searching for him.
McGlade is described as 5ft 5ins, with brown hair.
He has brown hair, is clean shaven and has a scar on his right hand.
McGlade was last seen wearing dark clothing, and possibly a green hoody.
Police are warning members of the public to not approach him.
Anyone who sees him should call 999 quoting incident 286 of January 7.