We did a hive removal last week on the campus of the local university.  The
subterranean hive was located in an irrigation switch box.  Like the water
meter boxes, it is about the size of a nuc (a bit bigger, actually)  and
has a convenient entrance hole.  The hive was doing great with the
equivalent of 8 deep frames of brood, honey and pollen and LOTS of bees.  I
do not believe they were very Africanized because they were not at all
aggressive.  Cell size ranged from 4.9 - 5.2 mm which, I suppose is
inconclusive.  There seemed to be many other suitable nest locations - no
lack of trees, etc. but the box seemed to make a very good home and they
had surely overwintered there.

Jonathan Ruel
Flagstaff, AZ
35 deg N, 111 deg W
7,000 ft elevation