Water transparency measurements in the deep Ionian Sea

A long optical base line spectrophotometer designed to measure light transmission in deep sea waters is described. The variable optical path length allows measurements without the need for absolute or external calibration. The spectrophotometer uses eight groups of uncollimated light sources emitting in the range 370–530 nm and was deployed at various depths at two locations in the Ionian Sea that are candidate sites for a future underwater neutrino telescope. Light transmission spectra at the two locations are presented and compared

Towers and KM3NeT

NESTOR Collaboration has deployed one NESTOR module of the deep-sea neutrino telescope at a depth of 4000m, 14km off the southwest coast of Greece. The deployment site provides excellent environmental data. Power and data were transferred through a 30 km electro-optical cable to the shore laboratory. In this report, we describe briefly the detector and the well-defined procedure for recovery and deployment of a detector attached to the electro-optical cable and we depict the deployment of several towers and complementary independent strings acoustically connected to the towers. (c) 2006 Elsevier B.V. All rights reserved