[Spaceships] Orion space drive: launch from underwater?

[dcarson]

Really good sensors let you detect things. Purified radioactives are rare anywhere. But large things moving underwater and thermal hot spots can be detected but unless you have a good baseline you don't know if that's industrial activity or a whales and natural thermal vents. So if they haven't been monitoring it will take a while to check all the unusual things they detect.