Use the Army Corps of Engineers, Navy Sea Bees, something like that. Look at https://en.wikipedia.org/wiki/Seikan_Tunnel going between islands under the Japan Seas in an earthquake area.

Think BIGGRRRR! (Aggressively so, instead of sissying around!)

edit: also not to forget about 'Nuclear Tunnel Boring Machines/Subterrene' https://havacuppahemlock1.blogspot.com/2015/06/nuclear-power...

cf. "Trans-Planetary Subway Systems

A Burgeoning Capability

by Robert M. Salter

February 1978"

https://www.rand.org/pubs/papers/P6092.html