Tunnels under the ocean

So I build a city on the ocean floor out of handwavium, Bioshock style, but I want an easier way to get there besides taking a boat to the middle of nowhere and then getting into a submersible.

I have an idea to dig a shaft deep into the ocean floor, and then make a tunnel leading to a near-by island, and if it goes well maybe extending to the mainland eventually.

Obviously once you go down to the ocean bottom there is a lot of pressure, but I'm thinking that by going down below the bottom the seabed will provide enough support to keep my tunnel from collapsing so I can have a dry path to run a rail line.

The feasibility of the city itself isn't a concern with this question. I'm just looking at a way to get to it.

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Communities

Tunnels under the ocean

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