There's a brief paper on the practicalities of using lava tubes as bases on Mars here: http://www.norwebster.com/mars/lavatube.html http://www.norwebster.com/m

There's a brief paper on the practicalities of using lava tubes as bases on Mars here: http://www.norwebster.com/mars/lavatube.html http://www.norwebster.com/mars/lavatube.html