  Liquid argon detectors, with mass up to 100 kton, are being actively studied
in the context of proton decay searches, neutrino astrophysics and for the next
generation of long baseline neutrino oscillation experiments to study the
neutrino mass hierarchy and CP violation in the leptonic sector. The proposed
Giant Liquid Argon Charge Imaging ExpeRiment (GLACIER) offers a well defined
conceptual design for such a detector. In this paper we present the GLACIER
design and some of the R&D activities pursued within the GLACIER.
