  This work provides a smooth and everywhere well-defined extension of
Bondi-Metzner-Sachs (BMS) supertranslations into the bulk of Minkowski space.
The supertranslations lead to physically distinct spacetimes, all isometric to
Minkowski space. This construction is in contrast to the often used, non-smooth
BMS transformations that appear in a gauge-fixed description of the theory.
