No, New York is not underwater (yet, anyhow) - that's a clever ad for HSBC by Ogilvy & Mather Mumbai ad agency in India. The bank wanted to raise awareness of the dangers of global warming, so the clever ad guys glue...
https://www.neatorama.com/2008/11/25/the-global-warming-swimming-pool-swimming-above-a-submerged-city/
The Global Warming Swimming Pool: Swimming Above a Submerged City...
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