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[Urist Da Vinci]

Couldn't you adapt the (exploity) way of draining the ocean or making a exit to the surface, where you mine a ramp through a closed bridge above your head?

Ocean drains. Dig out ramps leading up to the first level below an ocean. Build a bridge on that level, directly over the ramps (be sure to leave them in place!) and link it to a trigger. Carefully seal off the chamber to make it water tight. Now with the bridge in place, designate ramps up to the ocean adjacent to the bridge. Diggers with access to the level below the bridge can dig those ramps up from the level of the bridge, allowing the ocean to fill the chamber; even with the ramp squares underwater they can still dig them out. And not a drop of water will touch them... provided they clear out before you pull the lever.

You don't need to dig ramps above the bridge, as you only want to breach a 1-tile-thick wall, so you could simply mine it out.