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In terms of locating a Mars base, the obvious answer is 'follow the water. However, having discussed the energetics of fuel production and plastics production on Mars, I would suggest 'follow the methane'.
https://sciencetrends.com/nasa-rover-fi … d-on-mars/
'A study published in 2009 reported that plumes of thousands of tons of methane would occasionally jet out off the ground. It’s possible that the source of the methane is deep under the ground and the temperature fluctuations that Mars experiences between its winter and summer seasons force the methane to the surface. While this is a possible explanation for how the plumes of methane reach the surface, the origin of the methane is still unknown.'
If a Mars base can access thousands of tonnes of methane from subsurface deposits, propellant production could be accomplished by liquefying the methane. Oxygen could be produced by electrolysis of water, which is 70% efficient. Finding a source of methane would therefore greatly reduce the energy requirements associated with propellant production.
In the past, we have discussed the energy requirements of polymer production on Mars. Due to the low energy efficiency of attempting to synthesise alkenes from CO2 and water, plastics are a very energy intensive product on Mars. By starting out with fossil methane, the energy requirements of plastic production can be greatly reduced.
"Plan and prepare for every possibility, and you will never act. It is nobler to have courage as we stumble into half the things we fear than to analyse every possible obstacle and begin nothing. Great things are achieved by embracing great dangers."
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The methane if in sufficient amounts changes the whole energy needed equation for man to be able to go.
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Martian Life May Be Hiding in Islands of Habitability
https://www.airspacemag.com/daily-plane … 180977769/
Astroport Space Technologies, awarded a NASA Technology Research contract for lunar construction
http://www.spaceref.com/news/viewpr.html?pid=57471
Lockheed Martin, General Motors Team-up to Develop Next-Generation Lunar Rover for NASA Artemis Astronauts to Explore the Moon
https://www.prnewswire.com/news-release … 00065.html
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