Paramedics responded at 5:24 p.m. to the Brandywine River in the Alapocas Woods behind the DuPont Experimental Station for the report of a drowning.
At that location, bystanders saw a 19-year-old male jump into the river from a rope swing.
After he did not surface, bystanders found him in the water and pulled him to shore.
A nearby Delaware Department of Natural Resources and Environmental Control officer found the male in cardiac arrest and initiated CPR.
After their arrival, New Castle County paramedics continued CPR and treatment of the patient.
Treatment by the New Castle County paramedics and EMTs from the Talleyville Fire Company resulted in the patient regaining a heartbeat.
Personnel from the Talleyville Fire Company assisted in carrying the teen out of the woods.
He was flown to Christiana Hospital by Christiana Care LifeNet helicopter and admitted in critical condition.