A man who called police to say he was trapped in an underground storm drain in Boston has been rescued and charged with trespassing.

Daniel Kelly called police Monday night after getting lost inside a wall vent of the Ted Williams Tunnel, part of the Big Dig system.

Police asked him his location. State troopers using lights and sirens drove through the tunnel system to help locate him. A trooper saw his hand waving from a vent shaft on the tunnel's D Ramp wall about 15 feet off the ground.

Kelly pleaded not guilty Tuesday and was released without bail.

Kelly is from suburban Somerville. He says he remembers calling a cab after having several drinks at a bar but doesn't know how he ended up in the tunnel. He says he thinks someone spiked his drink.