The new prison in Zurich, Switzerland has capacity for 241 remand prisoners, but authorities decided to test the facility on local volunteers before it opens in April, Swissinfo reports.

More than 600 people have applied for the test run, during which they’ll experience real prison conditions for four days in March – giving up their phones and eating only prison meals.

Prison director Marc Eiermann told a local newspaper that it would not be a “holiday camp”, but added that volunteers would be allowed to leave early if they want.