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de_nuke unclipped

New Nuke unclipped.
You need to type r_portalsopenall 1 in console to fix visibility bugs. (alleyways invisible from a distance, not the giant black thing near CT Spawn.)
.nav file is from the original Nuke, if you improve it, you can send it to me and I will update the map and add you as a contributor.
If you use changelevel or map:
de_nuke_declip = new Nuke
de_nuke_unclip = old Nuke