@dsfpspacefl1ght@MikeMongo@Taraustralis Yes, I was in a lava tube in Hawaii, the floor is cluttered with debris. No way an inflatable lining will make it passable with major excavation. I agree that lava tubes are a really good idea until you actually study them. Then not so much. Possible but not easy.
@F_French Also: โWhile the actual amount of time that this flight might take could be longer, adding Venus to a Mars flight plan means that astronauts could return to Earth as much as a year sooner.โ This makes no sense. Either the outbound or inbound legsโnot bothโcould be shorter.
@F_French A couple of things need mentioning. The article indicates the white paper authors noted that โ This NASA report released in April mentions "two-year Mars class missions" as a future goalโ just means the NASA report writers were too lazy to write โtwo and a half yearโ.