Police in Indonesia are hunting for four foreigners who tunneled out of a prison in Bali, the BBC reports. 

The men escaped from Kerobokan Prison by crawling through a 39-foot-long tunnel dug under the walls, per Reuters. The prison chief says "we suspect it took more than a week to build" the 20-by-30-inch escape route. 

It was found filled with water on Monday morning. The inmates are believed to still be on the Indonesian resort island. Kerobokan houses 1,379 inmates, four times the official capacity, many of them foreigners. 

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