Captain Richard Farnfield, who has died aged 87, was a Cold War submariner who, in an underwater game of blind man’s bluff, held the record for the longest trail of a Soviet ballistic missile submarine.
In September 1978 Farnfield was commanding the hunter-killer nuclear submarine Sovereign when ordered to find a Soviet submarine in the eastern Atlantic. He had had just two days to familiarise his command team with Sovereign’s latest towed array sonar, which was clipped on from a tug and towed astern.
On September 29, Sovereign commenced Operation Agile Eagle in her patrol area south-west of Rockall, and found nothing until October 6, when intelligence indicated the presence of a Delta-class strategy missile-firing nuclear submarine (SSBN). At 2330 that evening Farnfield located the sub and spent three days slowly closing the range.
For several days Farnfield trailed the Delta, rising occasionally to periscope depth to transmit and receive the signals, but on October 20, when he dived to continue the trail, the Soviet sub unexpectedly began to “clear its arcs”.
British submarines did this by exaggerated turns to port and starboard using passive sonar to check that there was no submarine behind them. Soviet submarines practised another method nicknamed “Crazy Ivan”, which involved reversing course and hurtling down their original path at full speed while using active sonar. On this occasion the Delta passed some 800 yards down Sovereign’s starboard side, yet Sovereign remained undetected.