Low, rumbling feedback drone
Large city building room interior with heavy traffic passes and air conditioning.
Rumble of approaching subway train slowing as it nears the platform, distant exterior perspective
Hard percussive rain on sails and deck, rolling thunder and bow wash
Heavy wooden wheel rolling, with rumble and squeaks
Low frequency buzz tone alien machine loop
Distant gunfire on a battlefield, thunderous.
Distant gunfire on a battle filed, thunderous.
Distant gunfire on a battlefield.