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This isn't correct. The rocks on top are not to prevent the tunnel segments from resurfacing. The tunnel segments have ballast tanks which are empty during tow
by margalabargala 5y ago
This isn't correct. The rocks on top are not to prevent the tunnel segments from resurfacing.
The tunnel segments have ballast tanks which are empty during towing, then are filled with water to increase the density of the segment and sink it to the ocean floor.
- mhandley 5y agoYou are probably correct - I assumed the ballast tanks were part of the end doors, which were later removed, but re-watching, I think I read too much into that part of the video.