Prison officers became aware of the escape while conducting a morning check of inmates at the Kerobokan penitentiary in Bali's capital, Denpasar, said Putu Ika Prabawa, an officer at Bali's Kuta Utara police station.
Prabawa said the four men were believed to have escaped through a 50-by-70-centimeter (20-by-28-inch) hole found in a wall that connects to a 15-meter-long (49-foot-long) water tunnel heading toward a main street.
He identified the four as Shaun Edward Davidson, 33, of Australia; Dimitar Nikolov Iliev, 43, of Bulgaria; Sayed Mohammed Said, 31, of India; and Tee Koko King bin Tee Kim Sai, 50, of Malaysia.
Prabawa said police have distributed pictures of the escaped inmates to police stations across Bali.
Jailbreaks are common in Indonesia, where overcrowding has become a problem in prisons that are struggling to cope with poor funding and an influx of people arrested in a war on drugs. Most prisoners have been convicted on drug charges.
Last week, dozens of inmates escaped from an overcrowded prison in western Indonesia after floods caused a wall to collapse.
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