Not exactly the same but there has been consideration given to store ICBMs in lakes amongst other things: https://www.thedrive.com/the-war-zone/air-force-consid

Not exactly the same but there has been consideration given to store ICBMs in lakes amongst other things: https://www.thedrive.com/the-war-zone/air-force-considered-firing-icbms-from-lakes-tunnels-before-picking-new-missile https://www.thedrive.com/the-war-zone/air-force-considered-f...