"Seeing them all arriving was an impressive sight," Mr Anderson said.
He understood significant damage had been caused at the centre with walls smashed and structures burned.
"I've been told the detainees had free rein of the entire centre and, because I've spent many hours working out there, they would have had to cause considerable damage to achieve this."
Mr Anderson said he expected remedial work would begin almost immediately.
He described the mood among the 1500 permanent residents as anxious. "We had heard one person had escaped by scaling a fence on the perimeter and things at the centre deteriorated from there."
He said the majority of centre staff lived within the Christmas Island settlement which was 20km from the inland detention centre. That meant what happened at the centre circulated quickly.
Mr Anderson believed problems associated with the facility stemmed from its reactionary stance.
"The centre had already taken in a number of detainees awaiting or fighting deportation orders when extra staff were added. The numbers of detainees had built significantly when work began on making the place more secure. It's like they're putting measures in place after the event."
"However, before the riots, it was fairly obvious work being carried out at the centre was making it more like a prison than a detention centre for asylum seekers."
He said last year's government introduction of laws cracking down on foreign-born criminals and giving Australia's Immigration Minister Peter Dutton the power to deport anyone with a 12-month sentence who didn't have Australian citizenship, had changed dynamics on the island.
"Locals have always been aware of the difference between an asylum seeker and, perhaps, a 150kg man who has committed a crime that has warranted 12 months or more in prison. The riots have compounded their concerns."
But neither he nor his wife had any inclination to leave the island. "We love it here. It's easy tropical island living with great fishing and diving, gorgeous bush walks and a 27-degree average temperature."