Bali police were interviewing witnesses into Monday night as they continued the search for an Australian man and three other foreigners believed to have tunnelled out of Kerobokan prison.
'Up to tonight, there is no information that the four have been caught,' head of Badung District Police in Bali Yudith Hananta told AAP at around 9pm local time.
Shaun Davidson, 33, from Perth has found himself the subject of a manhunt after officials said he and three others escaped the notorious Bali prison early on Monday morning.
When they failed to show for roll call, a search of the prison's perimeter unearthed a covered tunnel - around 50 by 75cm wide - and 15 metres long, Kerobokan prison governor Tony Nainggolan said.
The tunnel travels underneath the prison wall and emerges at a road running along Kerobokan.
A guard tower hovers above it, but was unmanned at the time due to staff shortages.
'We will investigate if there's involvement from other prisoners or guards,' Mr Nainggolan said, with police adding that they were also looking into whether the men received any help from the outside.
Davidson had just two months and 15 days left to serve of his sentence for immigration offences after he was caught in April last year for using another man's passport on the popular tourist island.
However, the 33-year-old faced deportation after his sentence finished and was known to have been wanted in Perth for drug offences.
His alleged fellow escapees all lived with him in the same cell block in Kerobokan.
Dimitar Nikolov Iliev, 43, from Bulgaria was serving a seven-year term for money laundering, alleged fellow escapee Sayed Mohammed Said - a 31-year-old from India - was in the midst of a 14-year sentence for drugs.
Malaysian man, Tee Kok King, 50, is understood to be serving seven-and-a-half years for drug offences.
Head of Bali Corrections, Surung Pasaribu, said there was nothing in Indonesia's criminal code that would allow the men to be charged with escape, however they could face damaging a facility.
Staff shortages, chronic overcrowding and allegations of corruption have long plagued Indonesia's prisons.
Just last week, 76 inmates escaped Jambi jail in Sumatra after flooding caused the prison's walls to collapse.
In May, in another Sumatran facility, Pekanbaru, 442 prisoners made a run for it following allegations of guards charging people for cells in the chronically overcrowded facility.
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