The drone of the engine of a floating large ship:
-
Motor boat starts, waits, floats away
-
Motor boat sailing away
-
Yacht moves
-
The yacht is sailing, jamming
-
Expects to jam, The motor boat starts
-
The boat swims past fast
-
Moves, The motor boat starts
-
Boat is moving slowly
-
Motor boat moves against the tide
-
Captain’s cabin, Morse code,
-
Boat waiting, moving
-
Closes, The metal hatch of the ship opens
★★★★★