User blog comment:Willbachbakal/Singleplayer Plot/@comment-174.59.133.215-20110815031153/@comment-1330314-20110815134814

I think you misunderstood part of the above article. By "upward current" I mean an actual water current, not an electrical current. The energy mass, however, has been confirmed by the developers to be the source of the mutational powers behind ADAM, thus having it erupt into Rapture would not only "keep back the tide", as Fontaine put it, but stem it completely for a while for every Splicer in the city, thus letting them regain sanity for at least a short while.

As for Tenenbaum, as long as she's still alive she'd be wherever there are Little Sisters around. Not only that, but she's one of the most important characters in the BioShock series, and her presence in BioShock 2 resumed itself to a mere cameo.