The sea, she said, was a sort of intermediate stage for the subs, whose utility was off-world. ‘The past few years there’s been an explosion of funding. It’s changed everything, in terms of what we might do. Every major space agency has essentially torn up its twenty-year forecasts. We can go further now. Much further. And it’s realistic to think we can start doing so pretty soon. Saturn’s moons are a feasible target. If I tell you Europa’s seas are 100 miles thick, you’ll get an idea of why we’re interested in vents.’
