  We report the detection of 1.3mm continuum and near-infrared K-band
(2.2-micron) emission from the submillimeter galaxy SMM J00266+1708. Although
this galaxy is among the brightest sub-mm sources detected in the blank-sky
surveys (L~10^{13} L[sun]), SMM J00266+1708 had no reliable
optical/near-infrared counter-part. We used sensitive interferometric 1.3mm
observations with the Owens Valley Millimeter Array to accurately determine the
position of the sub-mm galaxy. Follow-up near-infrared imaging with the Keck I
telescope uncovered a new faint red galaxy at K=22.5 mag which is spatially
coincident with the 1.3mm emission. This is currently the faintest confirmed
counter-part of a sub-mm galaxy. Although the redshift of SMM J00266+1708 is
still unknown, its high sub-mm/radio spectral index suggests that the system is
at high redshift (z>2). Approximately 50% or more of the sub-mm galaxies are
faint/red galaxies similar to that of SMM J00266+1708. These ultraluminous
obscured galaxies account for a significant fraction of the total amount of
star-formation at high redshift despite being missed by optical/ultraviolet
surveys.
