Thanks! Most of them must be very heavy, I noticed they often use cranes to put them in the water in old photos. I wonder what it would be like to be inside one of those. I'm not very claustrophobic, but I'd have to be convinced really hard to get into something like this.
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What an experience that would be! Enough to make anyone claustrophobic. I mean, how terrifying if you notice a leak while you're in it.