In a first in the US, 3 precast concrete boxes have been pushed into place with hydraulic jacks underneath an active highway in Brevard County, Fla., as part of the $4-billion Brightline high-speed rail program to extend the line to Orlando from Miami and West Palm Beach.

https://www.enr.com/articles/51547-box-jacking-method-used-under-live-traffic-a-first-in-the-us