The 10 m(3) ICARUS module, used in Pavia until July 1999 for cryogenic and
mechanical tests, has been widely modified in order to reflect the final de
sign of the ICARUS 600 t detector. After transportation to the Gran Sasso L
aboratory. in February, 2000 it began recording high quality images of long
(more than 3 m) ionising tracks in the sensitive Argon volume. (C) 2001 Pu
blished by Elsevier Science B.V.