Also known as: Valentine Tanks, Studland Bay Tanks, Operation Smash Tanks
Resting in the shallow waters of Studland Bay lie seven Valentine infantry tanks — silent witnesses to the deadly rehearsals that preceded D-Day. In April 1944, during the top-secret Exercise "Operation Smash," these tanks were testing duplex-drive swimming modifications that would allow armour to float ashore on the Normandy beaches. The trials went tragically wrong: all seven sank, and six soldiers lost their lives. Today the tanks sit between 8 and 16 metres, encrusted with marine growth and surrounded by an ecosystem that has made them its own. Two are permanently buoyed and spaced roughly five metres apart, making them easy to locate. As a Scheduled Ancient Monument, the site carries strict legal protections — look but do not touch. For divers of any level, swimming alongside these D-Day training relics is a moving and accessible encounter with one of the war's lesser-known tragedies.
Seven Valentine infantry tanks sank during the top-secret D-Day training exercise "Operation Smash" in Studland Bay. Six soldiers were killed, only one body was recovered. The tanks were testing duplex-drive swimming modifications in preparation for the Normandy landings.
Valentine Tanks (Operation Smash) is a tank wreck located off Dorset, United Kingdom at a depth of 16 metres. The vessel was lost due to training exercise in 1944. The wreck is diveable.
Valentine Tanks (Operation Smash) lies at 8 to 16 metres depth, Studland Bay, Dorset.
Valentine Tanks (Operation Smash) was lost due to training exercise on 1 April 1944 during World War II — D-Day preparations, off Dorset, United Kingdom. 6 people lost their lives.
Diving the Valentine Tanks (Operation Smash) is rated beginner and is suitable for newly certified Open Water divers. Minimum certification: PADI Open Water / BSAC Ocean Diver. Recommended: PADI Open Water / BSAC Ocean Diver.
The best months to dive Valentine Tanks (Operation Smash) are April, May, June, July, August, September, October. Water temperature ranges from 7°C in winter to 18°C in summer.
Valentine Tanks (Operation Smash) is accessed by shore or boat from Swanage, Dorset, United Kingdom.
| Month | Temp | Visibility | Access | Marine life |
|---|---|---|---|---|
| Jan | 7.0°C | 4.0m | poor | Minimal — winter conditions |
| Feb | 7.5°C | 4.0m | poor | Minimal — winter conditions |
| Mar | 8.0°C | 5.0m | marginal | Minimal — winter conditions |
| Apr | 9.5°C | 6.0m | good | Moderate — season starting |
| May | 11.0°C | 8.0m | good | Good — cuttlefish, wrasse, pollack, nudibranchs |
| Jun | 13.5°C | 12.0m | good | Good — cuttlefish, wrasse, pollack, nudibranchs |
| Jul | 16.0°C | 16.0m | good | Peak — cuttlefish, large shoals, conger eels, nudibranchs, bass |
| Aug | 18.0°C | 20.0m | good | Peak — cuttlefish, large shoals, conger eels, nudibranchs, bass |
| Sep | 17.0°C | 15.0m | good | Good — cuttlefish, wrasse, pollack, nudibranchs |
| Oct | 14.0°C | 8.0m | good | Good — wrasse, pollack |
| Nov | 10.5°C | 6.0m | marginal | Minimal — winter conditions |
| Dec | 8.5°C | 4.0m | poor | Minimal — winter conditions |
2 evidence records from 2 sources.
Seven Valentine tanks sank during Operation Smash, April 1944. 6 soldiers killed. Scheduled Ancient Monument. Strict no touch, no take.
Studland Bay, Dorset. Tanks No. 1 and No. 2 permanently buoyed. ~5m apart. Damage to one tank prompted police investigation.
Studland Bay, Dorset