Status of the different projects

Different projects are in progress:
AMANDA~[#price##1#]
is a running project installed in the South Pole for which it has been demonstrated that deployment and logistics problems can be solved. In 1993-94 four strings were installed at 1000m depth (AMANDA A). The measurements of the ice transparency have shown that the light diffusion were too short (20-40cm). Four new strings (500m long) were deployed at 1500-2000m depth (AMANDA B). The measured atmospheric muon rate in AMANDA B is 25Hz and the coincidences AMANDA A-B occur with a frequency of 0.1Hz. The analysis of #tex2html_wrap_inline728# coincidences A-B shows that there is no up/down confusion. The scattering length of Cerenkov light in AMANDA B is two orders of magnitude larger than in AMANDA A. During winter 96-97 six new strings will complete AMANDA B.
ANTARES~[#bertin##1#]
is a project aiming at two goals: first the realization of a system capable to measure the environmental paremeters and, second, the realization of a ``demonstrator''. A system to measure the optical background due to bio-luminescence and to the Cerenkov light emission by electrons emitted in the #tex2html_wrap_inline730# decay of #tex2html_wrap_inline732#K present in the sea water is actually running. A system to measure the bio-fouling due to the sedimentation is also running. A system to measure the water transparency is under realization and will be operating next spring. A string equiped with 30 Benthos spheres, several of them instrumented as optical modules, will be deployed with an electro-optical cable linked to the shore. This stage will be ready at the beginning of 1998. At the beginning of 1999 three strings with 30 optical modules each will be deployed, linked together and to the shore with an electro-optical cable (``Demonstrator''). All these operations are performed off Toulon (France) at 30km from the shore and at 2400m depth. The guiding principle is that all operations performed with the demonstrator must be extrapolable to the km-scale detector. Works on digital and analog signal transmission and on the optimization of the detector layout are in progress.
Baikal~[#sokalski##1#]
is a project installed in the lake Baikal (Siberia) at 100m depth. The final detector will consist in eight strings supporting 192 optical modules. This project started in April 93 by deploying 36 PMTs in three half strings. The system was recovered after 300 days of running time. The main problem was the bio-fouling deposited on the glass spheres, mainly on the upward facing optical modules. In winter 96 four full strings were deployed (96 PMTs). Only two layers of PMTs are facing up. The next stage will be the deployment of at least 144 PMTs this winter. The analysis of #tex2html_wrap_inline734# events recorded in 1993 gave an evidence of two upward-goung muons when 1.2 is expected from atmospheric neutrinos.
DUMAND~[#learned##1#]
was the pioneering project located at the Hawaii Islands. The funding of this project has been cancelled in 1996 by DOE.
NESTOR~[#resvanis##1#]
is a project planned to be installed in a 3800m deep sea site offshore from Pylos (Greece). The project consists in one tower of 12 hexagonal floors of 16m in diameter supporting in total 168 PMTs. Two aluminium floors and one titanium floor are ready for mechanical tests in shallow water. The deployment is being studied, a digital transmission of the signal is being developed, a measurement of optical background has been recently performed.