NEW YORK (CBSNewYork) – There was an unusual sight at a Brooklyn subway station – it was under water!

The entrance to the Broadway G-train station in Williamsburg was completely submerged Wednesday.

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One confused rider tweeted the MTA asking for an explanation.

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It turns out MTA workers were testing a new “flex gate,” which is a barrier used to seal off the entrance during flooding.

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The transit agency said it worked (clearly) and responded to the rider by saying in part, “we’re doing this because climate change is real.”