So, seeing in the news that the search for the vanished Argentinian submarine, ARA San Juan (S-42) is ongoing, though there’s been a possibly ominous twist:

Argentina’s navy said on Wednesday it was investigating an unusual noise detected in the South Atlantic hours after it last communicated with a missing submarine, but refused to confirm whether it indicated an explosion.

Navy spokesman Enrique Balbi told reporters a “hydro-acoustic anomaly” was detected in the ocean almost three hours after the last communication with the vessel on November 15, 30 miles (48 kilometers) north of its last known position.

Asked if the noise could have been an explosion, the spokesman declined to speculate, saying only: “It has to be corroborated and looked into.”

telegraph.co.uk

I’m no submariner, nor would I ever claim to be an old salt, but to my layman’s ears, that really doesn’t sound good.