Very fast underwater object ?

It could be the shadow from a plane flying in front of the sun

Can you stop posting shit doctored/ai vids?

Submarine.

indeed an hypersonic one

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Did you guy's knew that Russian Navy have super cavitational torpedo called Skhval it use much simpler method then UFO's but still not conventional and since 2016 it can go at 640km/h underwater. Amount of things from biggest military powers we don't know are probably alarming.

Wind

Shadow.

shadow

@CDGBTC no boom, so not munitions UFOs? =)