:: : : : : : : : While rogue waves 3 times the height of Titanic's deck have been observed, I suspect that more ordinary things, like heavy rains, provided enough incentive to not leave the ventilation tubes open at the top . ( I supposed they could cap the tubes during heavy rains, but how long could they survive with no ventilation down below?
22.
The tunnel boring machine was dismantled and trucked west to SoDo, where it was reassembled the following month and launched again in July, Obayashi finished its excavation of the station site, including the main and emergency shafts, ventilation tubes and passenger crossover tunnels, in late June; construction of the station shafts progressed slowly, digging up to at a time, before the final concrete wall and waterproof lining were installed.
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