These are all problems that have been solved. There are many existing solutions for elevating people... Are you suggesting that it is impossible to build a sub

These are all problems that have been solved. There are many existing solutions for elevating people... Are you suggesting that it is impossible to build a subway where groundwater exists? [1] All sizable tunnels have ventilation. While we still run combustion engines, we could capture unburnt fuel vapor and use it. With electric vehicles the capacities needed are much lower. > How do you keep the precious animals you're trying to save from getting in there and getting trapped or run over? Animals will not have a reason to enter if there is not something to be gained. Currently, they are provoked by the need for water and food, which justify the dangerous risks they must take. Living every day as a gatherer with no guaranteed access to water is not something I'm not convinced you have the empathy to understand. [1] http://scienceline.org/2010/02/what-would-you-do-with-eight-million-gallons-of-water-every-day/ http://scienceline.org/2010/02/what-would-you-do-with-eight-...