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Multi-epoch narrow-band HST images of the bipolar Hii region Sh2-106 revealhighly supersonic nebular proper motions which increase with projected distancefrom the massive young stellar object S106~IR, reaching over ~30 mas/year (~150km/s at D=1.09 kpc) at a projected separation of ~1.4' (0.44 pc) from S106~IR.We propose that S106~IR experienced a $\sim10^{47}$ erg explosion ~3,500 yearsago. The explosion may be the result of a major accretion burst, a recentencounter with another star, or a consequence of the interaction of a companionwith the bloated photosphere of S106~IR as it grew from ~10 through ~15 Solarmasses at a high accretion rate. Near-IR images reveal fingers of molecularhydrogen emission pointing away from S106~IR and an asymmetric photon-dominatedregion surrounding the ionized nebula. Radio continuum and Brackett-gammaemission reveal a C-shaped bend in the plasma, either indicating motion ofS106~IR toward the east, or deflection of plasma toward the west by thesurrounding cloud. The Hii region bends around a ~1' diameter dark bay west ofS106~IR that may be shielded from direct illumination by a dense molecularclump. Herbig-Haro (HH) and Molecular Hydrogen Objects (MHOs) tracing outflowspowered by stars in the Sh2-106 proto-cluster such as the Class 0 source S106FIR are discussed.

Supersonic Expansion of the Bipolar Hii Region Sh2-106: A 3,500 Year-Old Explosion?