A teenager was gravely injured after falling under an MTA train while “subway surfing,” authorities said. The incident happened in Queens, at the 111st Street station in Corona, at around 8:15 a.m. Friday,

The boy was found lying in the northbound track bed at the 111th Street stop on the No. 7 train in Corona. Cops were called to the station after the teen fell at 8:17 a.m. and told by witnesses he

He was taken to NYC Health + Hospitals/Elmhurst, police said. An investigation into the incident is ongoing, according to authorities.

A 12-year-old boy was seriously hurt when he fell off a Queens train while subway surfing during the Friday morning rush, cops said. The pre-teen was recklessly riding on top of a No. 7 train at the 111th Street station in Corona around 8:15 a.