  Currently in Lake Baikal, a new generation neutrino telescope is being
deployed: the deep underwater Cherenkov detector of a cubic-kilometer scale
Baikal-GVD. Completion of the first stage of the telescope construction is
planned for 2021 with the implementation of 9 clusters. Each cluster is a
completely independent unit in all the aspects: triggering, calibration, data
transfer, etc. A high-energy particle might leave its trace in more than a
single cluster. To be able to merge events caused by such a particle in more
clusters, the appropriate inter-cluster time synchronization is vital.
