PC Hardmode "V" projection for this map

Fairly sure it is unless it gets hit directly by the V. and even if it did, at least some portion of the surface should be safe. Chlorophyte should take care of the underground.

EDIT: I hope you lined the tunnels (at least down to the 'underground' level) with some sort of material other than mud or dirt, like Clay, Wood, etc that can't be corrupted. Otherwise you could have corrupt grass on one edge of the tunnel and the resulting thorny vines would spread the corruption to the other side.
 
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Ahh. You don't have to line every single block with wood, what you can do is line the blocks UNTIL you reach the Underground Layer, and then make sure there is no grass nearby and that's it. Grass will not naturally spread to the underground (except for Jungle Grass IIRC).

And the Jungle, Chlorophyte will stop any spread underground so you only need to line the tunnels on the surface.
 
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