In the seven-year period from 2018 to 2024, as many as 175 sailors of the British Royal Navy, serving in the nuclear submarine force, have tested positive for various banned or illegal drugs.
According to the UK Ministry of Defence, of the total 175 cases, 52 submariners were caught using narcotics while on submarine duty, with 12 such cases reported in 2024 alone.
The sailors were found using cannabis, cocaine, ecstasy, steroids, and benzodiazepines, which are drugs used for treating insomnia and anxiety.
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What makes this more concerning is the fact that some of those who failed drug tests are believed to have been serving on the UK’s four Vanguard-class submarines, each valued at around £6bn. These vessels, which reportedly have longer stints at sea, carry the Trident II nuclear missiles—Britain’s ultimate deterrent—with at least one always deployed at sea.
According to a report by The Telegraph, drugs were not found in any search of a submarine in the seven-year period, but sailors testing positive have raised concerns.
The UK ministry of defence has asserted that it has a zero-tolerance policy towards drug abuse and that almost all those who tested positive for drugs were fired. It said strict measures are in place to crack down on drug abuse by armed forces personnel.
The Telegraph quoted sources as saying that a few personnel were likely spared punishment in cases where banned substances were taken unknowingly or where mitigating circumstances existed.
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“There is no place for drugs in our Armed Forces, especially in sensitive areas such as the submarine service, where there is an increased security risk of drug-takers being blackmailed for classified and sensitive information," The Telegraph quoted Philip Ingram, a former colonel in British military intelligence, as saying.
In the tightly controlled, high-risk environment of submarines, there is little margin for error. Drug use aboard submarines can lead to possible operational and strategic risks, as even minor lapses in judgment can compromise navigation, weapons handling, and emergency response in a high-stakes, confined environment. In the case of nuclear-armed submarines, such impairment raises serious concerns over safety, command reliability, and the security of critical deterrent systems.
“We operate a strict zero-tolerance policy towards drug misuse. Any individual found to have breached this policy can expect to face serious consequences, including immediate discharge from the service. Such behaviour is entirely incompatible with the high standards of professionalism, discipline, and integrity expected," The Telegraph quoted a Royal Navy spokesperson as saying.