A white smoke column rose over Peresvet in Moscow Oblast after a reported incident at a Roscosmos rocket engine test site earlier today.

Some Russian sources claim toxic heptyl-based fuel may have leaked during engine trials.
📹 Supernova+ pic.twitter.com/qvQv5P80wv

— Euromaidan Press (@EuromaidanPress) 10 octobre 2025

A white smoke column rose over Peresvet in Moscow Oblast after a reported incident at a Roscosmos rocket engine test site earlier today. Some Russian sources claim toxic heptyl-based fuel may have leaked during engine trials. Supernova+

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