Thread by @ChrisO_wiki

1/ Finland's national broadcaster Yle has published an interesting interview with an explosive ordnance disposal expert, retired Major Myka Tyry of the Finnish Defence Forces, on the Crimea Bridge blast. He makes a number of points I've not seen elsewhere.

2/ Tyry estimates that the explosives used "may have weighed between one and two thousand kilograms" (2,200-4,400 lb) but was "not a conventional mixture of fuel oil and ammonium nitrate, but something of much higher quality".

3/ He also points out that it wasn't just a big fireball, but was followed by "flaming torches in the air ... This suggests the use of combustible metals such as aluminium, magnesium or thermite to amplify the explosion."

4/ "In such an explosion, the burning metals spread over a much wider area than just the usual large fireball. That would explain how a train dozens of metres away caught fire from the explosion."

5/ Tyry suggests that the explosive payload may have included Russian-made thermite incendiaries. (The Russians have used these extensively in Ukraine, and the Ukrainians have captured unfired Russian thermite rockets; see thread below on this topic.)

https://twitter.com/ChrisO_wiki/status/1521991581615677441/

6/ He also comments that the explosion likely happened on the bridge deck, with "little air between the explosives and the deck. For example, exactly the height of the truck."

7/ He points to a lack of water disturbance as evidence against the possibilities of a boat bomb or sabotage of the bridge structure. An explosion at sea level would have caused a spout of water, he says, but this isn't visible in the published videos.

8/ He also points to the location of the visible damage: "If the explosive had been placed below the deck of the bridge, then there would have been no scorch marks from the explosion on the railings of the adjacent car lane."

9/ "Likewise, the 'flares' would have flown upwards, not downwards and sideways as they did in the explosion."

Interview is linked below (h/t @m5b71) – I'd be interested to see if any other EOD people have commented on this yet. /end
yle.fi/uutiset/74-200…

Also my own thoughts are here:

https://twitter.com/ChrisO_wiki/status/1579244657397354496?t=tVCKBFHqkJ_aDAbjdVKBzQ&s=19

Further commentary and observations on Tyry's interview here!

https://twitter.com/ChrisO_wiki/status/1579511852815781888

Just to clarify, since some people seem to be misunderstanding this point, Tyry is NOT suggesting the Russians bombed their own bridge - he's clear in the interview that he thinks the Ukrainians did it.