  We have mapped the submillimetre wavelength continuum emission from the
Subaru Deep Field (SDF) at 450 and 850 microns with the Submillimetre
Common-User Bolometer Array (SCUBA) detector on the James Clerk Maxwell
Telescope (JCMT). The near-IR image of the SDF is one of the deepest near-IR
images available and contains four `hyper extremely red objects' (HEROs). These
data allow us to test the connection between `extremely red objects' (EROs)
found in IR surveys and the population of bright submillimetre sources found
with SCUBA. We present a weak measurement of the average flux of the four
K-band selected HEROs of 1.15 (+/-0.46) mJy, which fails to support the
hypothesis that HEROs should be bright SCUBA sources. Our data are consistent
with the HEROs being objects with SEDs like that of Arp220 out to z~1.7,
however, the extinction in the HEROs must be about 1 magnitude greater in the
J-band than is the case for Arp220 and they would need to be 1.7 times as
luminous as Arp220. On the other hand, an evolutionary model of elliptical
galaxies at z~2-3 in a dusty starburst phase is also in agreement with the
submillimetre data, as was originally proposed for the HEROs.
