This Italian hotel has the worlds deepest pool which has a terrifying depth of 40 meters or a 12-storey building - Luxurylaunches
Deep sea - Wikipedia
8 Things That are about 40 Meters (m) Long – dimensionofstuff.com
Which sea has the greatest depth? - Quora
Twitter 上的Schmidt Ocean:"Get a #SenseOfScale for how deep #ROV #SuBastian goes: July 28 dive 2520m ~500m deeper than whales, 3x tallest build https://t.co/aNNhDTRDB0" / Twitter