>object 'going faster than the speed of sound underwater'
President Donald Trump told a cheering crowd in Georgia that the US has both "hypersonic" and "hydrosonic" missiles.
"Brand new missiles and rockets, hypersonic missiles. We have hypersonic and hydrosonic," Trump said in Valdosta. "You know what hydrosonic is? Water."
"We have them all," he continued.
https://www.businessinsider.com/trump-brags-about-nonexistent-weapon-to-cheering-crowd-in-georgia-2020-12