Oh yes. Pick up the book Blind Man's Bluff, about submarines in the Cold War.
There was a secret Soviet naval base on the Kamchatka peninsula. American figured there must be a secure communications cable between that base and Moscow, and that cable must run underneath the Sea of Ohkost. If we could tap that cable, we'd get a lot of secret uncoded communication. Problem? Where exactly is the cable?
An American officer figured it out. He grew up on the Mississippi river and whenever there were cables run under the river, there were signs on the banks to warn boats not to let their anchors down here. He figured the same must be true in Russia.
So a spy sub prowled the coast until it found such a warning sign. Problem of locating the cable was solved.
A specialized sub landed next to the cable, and divers attached recording devices o the cable. Every month or so, the sub would return, pick up the data, and put a new recorder in place.
The Soviets eventually found out about this during maintenance, and discovered the recording device stamped with MADE IN THE USA attached to the cable.