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underground mars city1.bp.blogspot.com/-7gvVC_Zk1Lw/XRy28MiCNqI/AAAAAAAAD3k/G5yxNetnezkbjyUPexPUWRdqTzWVGaIfwCLcBGAs/s1600/Mars%2Bcolony%2Bin%2Bartificial%2Bdomed%2Bcanyon%2B-%2Bdesign%2Bfor%2BMasdar%2BCity%2B%2528UAE%2529%2Bby%2BLAVA.jpg
1 sat \ 0 comments \ @satcat 4 Nov 2022 bitcoin
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A subterranean wonderland
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Scientists Discover Mysterious Structures Hidden Under The Surface of Marswww.ndtv.com/science/scientists-discover-mysterious-structures-hidden-under-the-surface-of-mars-6579050
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Toronto has 18 miles of underground pedestrian tunnels.
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150 sats \ 3 comments \ @Undisciplined 31 Jan science
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