tunnel excavation where careful system of waterproofing which is worked into acquired and are being converted into a huge dockyard the concrete covering of the shell. After half the total the rock would probably be sufficiently solid: to prevent An immense grav- any cave-in, no ing dock 700 feet… … with arms each Another im- 142 feet in length portant stretch has been erected. of tunnel excava- Four berths are tion occurs be- also being prepared on which vessels 700 feet in neath the northwestern corner of Central Park between thickness of concrete has been put in place, six layers length can…
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