The Reckoner crew travel to where the surprisingly intact bank vault had sunk down to, via tunnels that they created with the tensors. David has flashbacks about that day, and finds his father's remains, turned to steel. David becomes convinced that it was his father, and not anything else contained in the vault, that was related to Steelheart's weakness. Despite this, they decide to search all the safety deposit boxes to look for clues about Steelheart.

-Summary
http://coppermind.net/wiki/Steelheart/Summary#Chapter_1