Copper runs down into the well. It is one of the benefits of this storage medium: you can get it wet and not worry. You can expose it to vacuum and radiation. It is placid, inert. It is rope, not volatile celluloid or vulnerable magnetic tape. Twenty foot. Thirty. Forty. Fifty. She feels a slackening. Fifty foot to the bottom. If this turns out to be a wild goose chase, she will have to go fifty foot back up, exhaling all the way, and not get tangled in the line. She could run a garden hose down as a breathing tube. A hose like this one, in a plywood box behind the ladder. It might help somewhat, if she remembers to exhale into the water and not the hose.