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@sabri44220662 the "cannons" were some sort of plasma projector
the "cable" supplied the power
pic - firing of a modern plasma weapon - notice the smoke ring, which is the projectile - a self-stable plasma toroid
pics 2&3 - paintings of the Bombardment of Sveaborg - notice the smoke rings
https://t.co/QogiSDwH7o
What exactly could have caused this devastation ?
And what are those traces in the sky ?