CARVER, Mass. (WHDH) -- An off-duty firefighter rescued a man trapped in his pick-up truck after it landed upside-down in a pond on Saturday.

The truck quickly sank in the water close to some cranberry bogs in Carver. Witnesses rushed to help pull the unconscious man out of the cab, which was completely submerged. Police believe alcohol was involved in the wreck.

Carver firefighter, Adam Johnson, wasn't working, but lives nearby and immediately drove to the scene. Johnson wasn't willing to wait for EMTs.

“He had to remove that person from the window that was underneath the water, approximately 3 feet under the water, and that person was unconscious at the time,” said Craig Weston, chief of the Carver Fire Department.

Johnson jumped in the water, pulled out the victim, and performed rescue breaths.

“You work on instinct, we train real well. There were other people there. He was just about out of the truck when I arrived. We just brought him back on shore and brought him back,” said Johnson.

Firefighters are trained to be calm under pressure, but that also comes with experience. This was Johnson’s first major rescue, partly because he has only been a firefighter since April.

“It’s just about staying calm and doing what you need to do. Anybody would’ve done it. Anyone of us firefighters, it doesn’t matter who you are, you’re going to do it. You’re going to get in there and you’re going to help,” said Johnson.

Thanks to this rookie firefighter, the driver began to breathe again. He was rushed to the hospital and will survive.

“We have 75 officers and firefighters, and they all live in our community, and we're very proud of that,” said Weston.