Air Photo Expert John Ball has a website at www.air-photo.com.
His full reply is as follows:
Extending from the rear of each Birkenau cremation building (CREMAS 2 and
3) was a below-ground level room designed as a cold storage morgue without
vents or windows. Auschwitz 'eye-witnesses' say these 2 rooms were 'gas
chambers with protruding roof vents' through which cyanide gas pellets
were dropped, and the gas was expelled.
( http://www.air-photo.com/english/index.html)
CREMA 2 evidence from 1944 air photos is as follows:
On May 31 there is one long line east of the roof's centerline. On July
8 again there is one line east of the roof's centerline. On August 25 there
are 4 marks in a staggered pattern east of roof centerline. And on Sept.
13 all the marks have disappeared.
(http://www.air-photo.com/english/altered.html)
The May, 1993, inspection of CREMA 2 collapsed roof by John Ball shows
there are NO HOLES EAST OF THE CENTERLINE WHERE MARKS EXIST ON THE 1944
AIR PHOTOS, whereas west of the centerline there are 2 irregular shaped
holes that have been CUT THROUGH THE ROOF AT LOCATIONS WHERE NO MARKS EXIST
ON ANY 1944 AIR PHOTO.
The 2 holes were therefore CUT THROUGH THE 15 CENTIMETER (6 INCH) THICK
CEMENT ROOF AFTER 1944, which means that in 1944 the roof was SOLID CEMENT
WITH NO VENTS OR OPENINGS.
( http://www.air-photo.com/english/index.html),
CREMA 3 evidence from 1944 air photos is as follows:
On May 31, there are 4 marks in a staggered pattern. On July 8 there are
3 marks in different locations from May 31. On August 25 the 4 marks are
also in different locations from July 8. And on Sept. 13 the marks are
very faint and in different locations again.
The marks have therefore changed locations from May to July to August to
Sept., 1944 - proving they were movable objects and could not therefore
have been holes cut through the cement roof.
(http://www.air-photo.com/english/altered.html)
In May, 1993 the CREMA 3 roof could not be inspected as it was destroyed
in 1945.
In summary on CREMA 2 roof, the 1944 air photos and John Ball's 1993 roof
inspection show conclusively that no holes existed in 1944. 2 holes were
added after 1944. And on CREMA 3 roof, 1944 air photo roof marks change
locations from May to July to August to September, 1944, showing they were
moveable objects, and could not therefore have been holes cut through the
cement roof.
1944 air photos and 1993 Cremation Building inspection proves that in 1944
there were NO VENTS HOLES IN ROOFS OF EITHER CREMA 2 OR 3 ALLEGED 'GAS
CHAMBERS' that would have been necesssary to drop cyanide gas pellets,
and expell the resulting gas - which proves it would have been impossible
for people to have been murdered by gas as described by alleged 'eye witnesses'.
And one specific, important point:
Nizkor writes that in a shrill, specious argument that ". . . all
this means is that corpses were not being burned on those particular days."
What happened to the often-claimed "around-the-clock gassings and
cremations" claims?