An "air pocket" saved a woman's life after her vehicle plunged into Lake Houston on Thursday morning, according to authorities.

Police tell us she drove off the boat ramp at Duessen Park into Lake Houston at around 9 a.m. Fortunately, a passerby heard a splash and saw the car going under, then called for help. Officers then pulled the woman from the submerged car.

"For me, I've been doing this almost 30 years, and a situation like that usually doesn't have that kind of outcome that we had today. We were very luck and very happy," said Sgt. Kim Fonville, with the Harris County Sheriff's Office.

Fonville says the woman "floated out" of a broken window as the car, in the water 45 to 50 minutes, was pulled from the lake. Fonville says an air pocket saved the woman's life.

The 60-year-old woman was taken to the hospital. No word on her condition or what caused her to drive into the lake.

The incident is under investigation by HPD Lake Patrol.