Budget Watch Survives Deep Sea Test, Reveals History of Underwater Espionage

A $15 Casio F91W watch, after a simple oil-filling modification, was successfully taken to nearly 5,000 meters underwater by a remotely operated vehicle (ROV) and returned intact. This incredible feat highlights the surprising pressure resistance of inexpensive equipment and underscores the long and secretive history of deep-sea espionage. From Cold War submarine recovery operations to modern-day sabotage of undersea cables, the deep ocean has served as a critical—and often unseen—battleground for intelligence gathering and covert actions. The article explores both historical incidents like Operation Ivy Bells and recent events, emphasizing the growing sophistication of underwater warfare and the challenges of attribution.