By Caroline Taylor

For whales, sound is survival. It guides migration, sustains family bonds, and makes feeding possible in a world where light barely travels. Yet underwater noise pollution, largely caused by human activity, has transformed the ocean from an acoustic habitat into a constant disturbance.

Over the past two centuries, ambient ocean noise has shifted sharply toward anthropogenic sources. Commercial shipping, military sonar, offshore construction, and seismic exploration now dominate marine soundscapes. A 2024 study published in Movement Ecology shows that rising background noise does more than annoy whales. It actively disrupts migration by shrinking the distance over which they can hear one another and detect environmental cues. In extreme scenarios, researchers found that whales may fail to reach their destinations altogether due to confusion or avoidance behavior (Johnston & Painter, 2024).

This disruption carries cascading consequences. When communication breaks down, whales expend more energy traveling longer distances, struggle to coordinate feeding, and experience elevated stress. These effects are not isolated or speculative. According to recent reporting from the Raincoast Conservation Foundation, endangered killer whales in the Pacific Northwest are calling less frequently as vessel noise increases, sometimes reducing call rates by over 20 percent during louder conditions. Silence, in this context, is not peace. It is displacement (Raincoast, 2026).

The framing of whale deaths often centers on ship strikes or entanglement, but underwater noise pollution operates more subtly and more pervasively. It rarely kills outright. Instead, it erodes behavior, culture, and reproductive success over time. This raises a harder question. If human noise systematically prevents whales from feeding, migrating, or communicating, where does responsibility lie?

Calling ships the “true killers” may oversimplify the issue, but ignoring acoustic pollution allows it to continue unchecked. Quieter ship designs, speed reductions, and protected acoustic habitats already exist as viable solutions. Whether they are adopted depends on whether we are willing to treat sound as a shared environmental resource, one we are currently taking without consent.

Sources:

• Avoidance, confusion or solitude? Modelling how noise pollution affects whale migration | Movement Ecology | Springer Nature Link
• New research aims to bring underwater noise’s true impact on killer whales into focus | Raincoast