Barnacle covered bike discovered docked at Upper West Side Citi Bike station

UPPER WEST SIDE, Manhattan (WABC) -- There is a Citi Bike mystery on the Upper West Side of Manhattan.

Somehow, a bicycle ended up covered in barnacles. So who took the time and effort to return it to a docking station?

Filmmaker Ted Geoghegan tweeted a picture of the bicycle after he discovered it docked at 73rd Street and Riverside over the weekend.

It looks like it had been fished out of a river.

Citi Bike has removed the bicycle from service.

The company says it was last rented 15 months ago.

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