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What happens when an earthquake causes his tunnel to no longer being aligned all unexpected like?

There are challenges with working in a seismically active zone. I'm sure he has thought about it. I'd be curious what answers he came up with.

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Faults don't suddenly show up for no reason out of the blue. So, the traditional solution is to treat fault lines as a special case and design for some shifting over the useful life of a tunnel.

The route the article suggests is likely to encoutner a lot of existing fault lines. For example there is one running through LAX itself, and a series that run through Santa Monica.

See http://www.cccarto.com/faults/la_faults/ for a map of the bigger ones. (A lot of little fracture zones are not shown there.)

Boring a tunnel through an active fault line still seems risky to me.

I am answering the same in two different comments but, if you look at Japan, their major cities are all covered by huge metro networks and they have earthquakes daily.

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