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The deployment of the Baikal-GVD deep underwater neutrino telescope iscontinuing in Lake Baikal. By April 2022, ten clusters of the telescope wereput into operation, with 2880 optical modules in total. One of the relevanttasks in this context is to study the possibilities of increasing theefficiency of the detector based on the experience of its operation and theresults obtained at other neutrino telescopes in recent years. In this paper, avariant of optimizing the configuration of the telescope is considered, basedon the installation of additional strings of optical modules between theclusters (external strings). An experimental version of the external string wasinstalled in Lake Baikal in April 2022. This paper presents a first estimate ofthe impact of adding external strings on the neutrino detection efficiency, aswell as the technical implementation of the detection and data acquisitionsystems of the external string and first results of its in-situ tests.

Increasing the sensitivity of the Baikal-GVD neutrino telescope by using external strings of optical modules