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There are a few things you can count on every summer in New York City: Mister Softee jingles echoing down the block, fire hydrants spraying kids on the corner, and subway platforms so sweaty they feel like the ninth circle of hell. Step onto the platform and you’re instantly transformed into a human puddle, dripping like you just got dunked in the East River.

The MTA swears it’s heard the collective groans—and sweat drops—of millions, and is now digging deep (literally) to test geothermal cooling , a system that basically shuttles trapped platform heat deep underground, at two of its steamiest stations.

If it works, the platforms could hover in the (almost luxurious) 82-85°F range on scorching days. Not exactly chilly, but compared to the current sauna conditions, it’s p

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