It's at least 10x harder to build a human-staffed base on the Moon than to build one at the bottom of the ocean. And it's 10x harder still to build one on Mars.

It's at least 10x harder to build a human-staffed base on the Moon than to build one at the bottom of the ocean. And it's 10x harder still to build one on Mars. (And that's optimistic; those numbers probably need more zeros.) Likewise Level 5 self-driving cars. Every level is at least one more zero on the hardness multiplier. Neither is gonna happen soon. They will happen some day, and none of this means we shouldn't work on them now, but yeah, the hype is ridiculous.