This cathedral-sized cistern is an
underground chamber
approximately 143 metres
(470 ft) by 65 metres
(210 ft) - about
9,800 square metres
(105,000 sq ft) in area
- capable of holding
80,000 cubic metres
(2,800,000 cu ft) of
water. The ceiling is
supported by a forest of
336 marble columns, each
9 metres (30 ft) high,
arranged in 12 rows of
28 columns spaced
4.9 metres (16 ft)
apart. The capitals of
the columns are mainly
Ionic and Corinthian
styles, with the
exception of a few Doric
style with no
engravings.
The
cistern is surrounded by
a firebrick wall with a
thickness of 4 metres
(13 ft) and coated with
a waterproofing mortar.
The cistern's water was
provided from the
Belgrade Woods—which lie
19 kilometres (12 mi)
north of the city—via
aqueducts built by the
Emperor
Justinian.
Cracks
to masonry and damaged
columns were repaired in
1968, with additional
restoration in 1985 by
the Istanbul
Metropolitan Museum; the
cistern was opened to
the public on 9
September 1987.