Cuvier's Beaked Whale Welfare: Military Sonar and Mass Strandings

Cuvier's beaked whales are deep-diving cetaceans highly vulnerable to military sonar exercises, which trigger panicked ascents causing gas bubble disease and mass strandings with severe welfare consequences.

Key Facts

Cuvier's beaked whales hold the record for deepest and longest mammal dives — exceeding 2,990 metres and 3 hours
Mass strandings correlating with military sonar exercises have been documented since the 1960s
The EU and US Navy have established some sonar restriction zones after legal challenges citing cetacean welfare
Stranded beaked whales typically die within hours — rescue attempts are rarely successful for this deep-water species

Welfare Considerations

Sonar-exposed beaked whales ascending rapidly to escape the noise develop decompression sickness equivalent to 'the bends' in human divers — gas bubbles form in tissues causing joint pain, organ damage, and neurological injury. Stranded whales on beaches experience hyperthermia from sun exposure, organ compression from body weight, and dehydration. Death is rarely rapid. The connection between sonar and strandings is now well-established scientifically, making each sonar-related mass stranding a preventable welfare harm.

What You Can Do

Support Whale and Dolphin Conservation campaigns for sonar-free marine protected areas
Advocate for mandatory marine mammal observer programmes on naval exercise vessels
Donate to IFAW stranding response capacity in countries adjacent to naval exercise areas
Raise awareness that military sonar is a major and ongoing cetacean welfare issue