  The IRAM Plateau de Bure mm interferometer and deep K-band imaging have been
used to identify the brightest submm source detected in the Lockman field of
the UK 8mJy SCUBA survey. The near infrared counterpart is an extended
(20-30kpc), clumpy, and extremely red object. The spectral energy distribution
suggests it to be a dusty star forming object at a redshift of about 3 (2-4).
Its star formation rate and near-infrared properties are consistent with
Lockman850.1 being a massive elliptical in formation.
