ICDS research fellow Kalev Stoicescu told radio Vikerraadio (Estonian Public Broadcasting, ERR) that the blast that occurred on 8 August, 2019, in the vicinity of Severodvinsk, and emitted (at least temporarily) radiation is clearly linked to a highly sensitive Russian military project/experiment, which explains the secrecy, i.e. scarce and rather contradictory explanations by Russian authorities (Ministry of Defence and Rosatom).
According to Stoicescu it is possible that the incident occurred while the Russian military were testing (the engine of) one of the “wonder weapons” described by president Vladimir Putin in his address to the Federal Assembly on 1 March, 2018, namely the so-called „Burevestnic“ hypersonic missile.
Listen to the full interview in Estonian on Vikerraadio.