Mr Brennan's business, Dive Centre Campbelltown, was broken into and goods worth $9000 were stolen early on Sunday, April 13, and since then he has decided not to leave the place.

A plasma television and 10 computers were taken from the Queen Street, Campbelltown shop.

Mr Brennan said he would sleep at the store until the real estate agent installed metal security roller doors.

"They just kicked the door down and smashed the glass," he said. "I didn't suspect this would happen and now I

have been sleeping in my shop since the robbery."

Police said a gold Mitsubishi Magna was seen driving away from the store at the time.

A man in his early 30s wearing a navy-blue Champion hooded jumper, dark jeans and sneakers could help officers with their investigation.

Mr Brennan said the thieves had probably visited the shop earlier to case it out before they stole the goods.

Anyone with information is urged to contact Campbelltown police, 46201199 or Crime Stoppers, 1800333000.