Nor are you particularly aware of it from the inside. The trick here is that all visitors will be whisked up to the top floors to start and finish their tour. On those top floors, you have some big, open views out over the city and, best of all, a semi-enclosed observation deck off the restaurant at the very apex of the building looking out over the seascape to the majestic Humber Bridge in the middle distance. You haven’t been able to see these views before, for the simple reason that there was nowhere in the city open to the public where you could get up this high.

From there, your route will take you down ramps through the whole building - and also, such is the concept of the exhibition, from the surface of the sea down to the very bottom of the ocean, and from the beginning of time to the future. We won’t know how well they have managed this until opening day, but the concept is strong enough and simple enough to work.

The Deep’s chief executive, the admirably open Colin Brown, isn’t worried about the content. He also knows that aquatic attractions of all kinds in Britain - even the ones he dismisses as “fish zoos” - are reliably popular. He points out that both the mega-successful Eden Project in Cornwall (by Farrell’s erstwhile partner Nick Grimshaw) and The Deep are essentially 21st-century reinterpretations of proven Victorian ideas, respectively the botanical glasshouse and the aquarium. He will ask a modest £6 entry fee, £4 for children. But he knows he has a job on his hands. “We’re extremely strong on the product, but it’s in Hull. We have to overcome that geographical isolation,” he says.