Godzilla swims 40 knots

“Helmsman,” he barked.  “Take us down to five hundred feet.  Increase speed to forty knots.”
“Aye, Captain,” the helmsman answered.
The Akula shot forward in the water.  The nose of the bullet-shaped ship tilted forward and the submarine slipped deeper into the Pacific Ocean.
Sterenko watched Ivanovich at the sonar screen.
“Sir,” the young man spoke after a moment, “the object has changed course.  It’s matching our speed.  No!  It’s going faster.”  Ivanovich was tense now, and his fear was contagious.  Everyone on the Akula’s bridge was nervous as they listened to the sonar man.
“The object is passing us.  It’s moving ahead of us.  I--I can’t believe how fast it’s going!  Its speed is… impossible.”