If it wasn't already clear that Elon Musk has considered virtually every aspect of what it would take to colonize Mars, it is now. As part of his Reddit AMA session, the SpaceX founder has revealed that his vision of a permanent colony would entail a huge number of "miner/tunneling droids." The robots would build large volumes of underground pressurized space for industrial activity, leaving geodesic domes (made of carbon fiber and glass) for everyday living. As a resident, you might never see the'ugly' side of settling the Red Planet. Musk also explained how his colony would get to the point where it can reliably refuel spacecraft all by itself.

For decades, futurists have predicted that commercial miners would one day tap the unimaginable mineral wealth of the world's ocean floor. Soon, that subsea gold rush could finally begin: The world's first deep-sea mining robots are poised to rip into rich deposits of copper, gold, and silver 1,600 meters down at the bottom of the Bismarck Sea, near Papua New Guinea. The massive machines, which are to be tested sometime in 2016, are part of a high-stakes gamble for the Toronto-based mining company Nautilus Minerals. Nautilus's machines have been ready to go since 2012, when a dispute between the firm and the Papua New Guinean government stalled the project. What broke the impasse was the company's offer, in 2014, to provide Papua New Guinea with certain intellectual property from the mining project.