This study focuses on the validation of variance reduction techniques (VRTs) in SERPENT using the Baikal-1 Skyshine Benchmark Experiment from the International Criticality Safety Benchmark Evaluation Project (ICSBEP) Handbook. The Baikal-1 experiment provides a comprehensive set of benchmark data that can be used to assess the accuracy and efficiency of neutron transport codes, specifically in the context of skyshine radiation. After reviewing the original MCNP input, a SERPENT input was created to replicate it as closely as possible. The VRTs were applied to detectors positioned 1 m above ground, arranged in a straight line every 100 m up to 1000 m away from the RA reactor, measuring neutron thermal flux, neutron intermediate-fast flux, and neutron dose.