This is one of those good news/bad news stories. The bad news, from the pespective of the trespasser, is he was arrested. The good news is he ended up being booked in the same prison he was trying to get into. So in a way it all worked out in the end:

Police arrested a man Sunday night they say had broken into a secure area of the King County Jail and was trying to enter the building itself.

Jail staffers called Seattle police about 9:50 p.m. and reported the suspect had climbed a perimeter fence and was loose in an enclosed area of the jail.

Whatever his reason, the man was booked on criminal trespass charges into the very jail he had been trying to break into.