Human fighter pilots are capable of achieving 9 G forces in flight.
And some of the military planes can withstand 16 G's.
"SR-71 at 3,000 mph takes half of the state of Ohio to turnaround."
These UAP - UFO turn on a dime at over 300 G's.
The UFOs are capable (not design compromise like a seaplane) to traveling in air and underwater.
https://youtu.be/_TtifTBVk_8