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MIAMI (CBSMiami) – A silver Mazda was pulled from a retention pond at a rest stop on Interstate 75 in western Broward County Tuesday afternoon.

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The car apparently had been there for two and a half days, with the bodies of two young men inside.

Relatives said the owner of the car, 21-year-old Sebastian Ramos of the Bonita Springs area, had gone to a concert in South Florida Saturday with his good friend, 25-year-old Josh Lausche.

The pair was last seen leaving the Hard Rock Casino in Hollywood about 2 a.m. Sunday. They were headed across the state after a day and night of fun in South Florida.

Relatives reported them missing Sunday after not having heard from them and being unable to reach them.

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The car in the retention pond was discovered by a motorist, who noticed the fence around the pond was knocked down.

It was a tremendous crash. Heavy damage to the car suggested it plowed into the bottom of the shallow water.

How the driver, presumably Ramos, came to lose control, missing a curve on the ramp and plowing through the fence, is unknown.

“We will look at speed as a factor. We will look to see if alcohol was involved,” said Sgt. Mark Wysocky of the Florida Highway Patrol. “It will all be part of the investigation.”

The car went undiscovered for so long, apparently, because the crash happened in the wee hours of Sunday morning and there were no witnesses.

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Ramos was a student at Florida Gulf Coast University. Lausche had returned to West Florida from Minnesota about a year ago.