On the 18th of March 2005 we drilled a hole into the floor
of the chorus of St. Vitus´ Cathedral, where, according to
a series of geophysical measurements, a cavity was to be expected.
84 cm below the paving we actually found a hollow space. A
candid camera was inserted into the drill hole of 38 mm in
diameter. The camera was placed on an adjustable operating
rod with attached laser measuring instruments. This system
(see the scheme below) gave us a notion of the arrangement
and size of the burial chambers. The data was used for the
calibration of system no. 2 (an exploratory camera placed
on a telescopic robotic arm with a range of more than 4 m
from the axis of the drill hole).
1 - monitor, 2 - camera, lights and laser control, 3 - probe
operation, 4 - drill hole, 5 - operating adjustable rod,
6 - lights on a moving ramp, 7 - exploratory minicamera,
8 - laser
