A fresh debate has emerged over the possible use of trained dolphins in military operations as tensions remain high in the Strait of Hormuz, a key global oil shipping route at the centre of the US Iran standoff.
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The unusual discussion gained attention after US Defense Secretary Pete Hegseth was asked during a press briefing whether Iran could deploy dolphins to challenge the US Navy in maritime operations. Hegseth responded by saying Iran does not currently possess such capabilities, but he declined to directly confirm or deny whether the United States has similar assets.
The comments reignited public curiosity about the long-running US Navy Marine Mammal Program, which has operated since 1959 under the Naval Information Warfare Center Pacific. The programme trains dolphins and sea lions for underwater missions, primarily mine detection, object recovery, and harbour security.
Experts say dolphins are particularly effective in detecting underwater threats due to their advanced biological sonar, which often outperforms man-made systems in murky or low-visibility waters. However, specialists clarified that these animals are not used as offensive weapons or “suicide dolphins.”
Instead, dolphins are trained to identify underwater mines or suspicious objects and alert military divers, who then neutralise the threats. Analysts noted that such marine mammals are generally deployed in post-conflict or security-clearing operations rather than active combat zones.
Reports have previously suggested Iran acquired dolphins from Russia in the early 2000s, though analysts believe those animals are likely no longer operational for military use.
Recent media speculation linked the discussion to reports of possible mine-laying activities in the Strait of Hormuz, where shipping disruptions have raised global economic concerns.
Military researchers say the US programme has faced criticism from animal rights groups over ethical concerns. However, programme officials maintain the animals are well cared for and voluntarily return during training exercises because of safety, food access, and established conditioning.
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While no evidence suggests dolphins are currently involved in operations in Hormuz, the conversation has highlighted the unconventional technologies that remain part of modern naval strategy.