Video of demolition of 462 m tall longwave mast in Russia

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I know the other video, too. But what is also interesting: at the end of the Russian video the demolition team metres out the debris. Obviously they did not believe how tall it was.

In fact, the height of the CHAYKA-masts ( some chains are still in operation as LORAN-C in Northern Europe) was and is obviously kept secret for these objects. There is an other 462 metres tall CHAYKA-mast at Dudinka, still standing. How many forumers know of its existence? And that who know, since when do they know from its enormous height?