A scuba diver managed to record an earthquake on the sea floor.
I couldn’t find much about it, other than this reddit comment: “The person shooting this is the husband of my close friend. His name is Jan Paul Rodriguez; he is pretty much an IRL hero in the Philippine Coast Guard. He shot this while diving when a 5.7 magnitude earthquake hit Mabini, Philippines on April 8th (there was actually 2 earthquakes within 2 minutes of each other) for anyone that is curious about the source.”