Is an "Underwater Metropolis" possible today?

Im sure some are familiar with Bioshock's "Rapture City," a (somewhat) successful underwater city that was able to maintain stability and house an entire population. But, using current technology and engineering, could we (and how) construct a city off the west coast of the United States that:

1. Is located on the side of an underwater ravine.
2. Has a max depth of 400 meters
3. Can inhabit max of 30,000 people
4. Has a source of food and water (preferably not imported from the mainland)
5. Adequate defense systems

6. Standard city departments (Education, law enforcement, public works, etc.)

   Keep in mind, however unrealistic, that budget is practically unlimited, but stay reasonable.

NOTE: If any further clarification is needed, let me know. The more critique,the better

posted over 8 years ago

Nathan Hardy‭

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