Union Square just got a little more mysterious. Hidden beneath Mission Ceviche’s massive flagship restaurant , Sub-Mission is a new subterranean cocktail lounge that mixes speakeasy allure with Peruvian flair—and it’s shaping up to be downtown’s next late-night magnet.

The 1,000-square-foot hideaway, located at 7 East 17th Street, takes the phrase “below the surface” quite literally. Guests descend from the ceviche bar upstairs into a jewel-toned cocoon of gold, green and soft lighting. The centerpiece is a glowing U-shaped bar crowned by a chandelier and flanked by plush banquettes that seat 65. Fashion portraits, moody lamps and color-shifting backlit panels (yes, guests can choose the hue) complete the glamorous tableau.

The team behind Mission Ceviche, consisting of Chef

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