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In early August, a garbled recording of a voice speaking Russian was heard by listeners. A few days later, on 23 August at 13:35 UTC, a clearer voice read out the following message twice: “UVB-76, UVB-76 — 93 882 naimina 74 14 35 74 — 9 3 8 8 2 nikolai, anna, ivan, michail, ivan, nikolai, anna, 7, 4, 1, 4, 3, 5, 7, 4″, before returning to its normal broadcasting.
Since then, a number of other distorted voices have appeared over the normal buzzing transmission, as well as knocks and shuffles, as if someone were moving things around inside the broadcasting room. It’s believed that the transmission site has an open microphone, which occasionally picks up sounds from technicians working within the broadcast site.
Additional story at: http://www.wired.co.uk/news/archive/2010-08/25/russian-numbers-station-broadcast-changes
(R Netherlands Media Network Weblog)