TARRANT COUNTY, Texas (CBSDFW.COM) – A dive team will go back in to a North Texas lake this weekend to try to solve the mystery of what happened to three missing girls.

Last month, the divers pulled a car from Benbrook Lake.

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On Saturday, they’ll go in to pull a second vehicle out of the lake.

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They’re trying to find a 9, 14 and 17-year-old who all vanished during a shopping trip in 1974.

missing girls from 1974 (Facebook: Missing Fort Worth Trio)

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One of the girls’ brothers believes a person of interest in the case may have dumped a car in the lake.