Gravity acceleration is 9.8 m/s^2 and I don’t know if there is a mean max. velocity in air. Maybe some smart person here on FR knows what it is in water?!
I might not of been clear. I wasn’t talking about falling, I was talking about walking the distance just so readers get a feel for the distance.
If the ocean where to disappear and a person was to fall to the wreck we have to look at skydiving. When skydiving the average terminal velocity of a skydiver is around 197 feet per second. If you divide 18,000’ by 197’ you get 91 seconds of free fall before you would smack into the mephitic ooze of the sea bottom like a bullet hitting mud.
Wouldn’t the gravity acceleration constant would be affected by the resistance of water and pockets of buoyancy left within the ship?