Can Mars colonies use the interior of mountains and hills rather than the surface?

I am writing a fiction about Mars, 300 yrs after colonization. Earth turns hyper-fundamental and cuts off all communication, so they've been on their own for the past two centuries. In constructing this world, I think perhaps the place to build the three redundant settlements is in the interiors of hills or mountains, rather than on the surface with all the radiation, dust storms, and very low temperatures. Is this feasible? Also, rather than the old moon-buggy or hab-lab transports, what about underground tunnels. Sound way better. Thanks

posted about 8 years ago

Phyllis Stewart‭

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