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https://www.youtube.com/watch?v=6sLPedbpd2o
https://www.youtube.com/watch?v=aam2hYPXrSo
https://theportalwiki.com/wiki/The_Underground/Episode_2_Transcript
https://steamcommunity.com/groups/TheUndergroundMachinima
https://tvtropes.org/pmwiki/pmwiki.php/Machinima/TheUnderground
https://developer.valvesoftware.com/wiki/Underground_(Portal_2)
https://nazizombiesplus.fandom.com/wiki/File:The_Underground_-_Episode...
https://www.artstation.com/artwork/kaEny
https://www.ancient-code.com/a-hidden-portal-to-another-world-a-secret...
https://www.moddb.com/mods/portal-underground-story
http://www.bbc.com/travel/story/20161121-a-portal-to-a-subterranean-re...
https://www.reddit.com/r/Minecraft/comments/6kue4i/my_nether_portal_en...
https://tfl.gov.uk/info-for/business-and-commercial/innovation-portal
https://en.wikipedia.org/wiki/Tunnel
http://www.macmahon.com.au/images/pdfs/MAH-Underground-Portal-Establis...
https://researchportal.port.ac.uk/portal/en/publications/theatre-revie...
Co-Authored By:
2020-11-28