The Hidden Source of Underwater Noise Pollution

Surprising but true: A small motorboat at just 11.5 m/s can radiate underwater noise levels comparable to a 45 m ferry—and sometimes even rival container ships. For years, regulations and research have focused on massive vessels, while millions of smaller boats have quietly shaped the underwater soundscape.

When people think of noisy ships at sea, they usually picture massive container vessels or cruise liners. But here’s the surprise: small boats can be just as noisy underwater as much larger ships.

Scientists behind the HearMyShip project investigated how various vessels—from ferries to fishing boats—generate underwater radiated noise (URN). This noise comes mainly from engines, propellers, and the bubbles they create (called cavitation). While big ships obviously make a lot of noise, the research showed that even a small motorboat can generate underwater sound levels strong enough to disturb marine life.

Why does this matter? Because underwater noise pollution is a growing problem. Sound travels much farther underwater than in air, and many animals—like dolphins, whales, and even lobsters—depend on sound to communicate, find food, and survive. Too much noise can confuse, stress, or even harm them.

The study highlights that focusing only on large commercial ships is not enough. With millions of small vessels worldwide, they also play a big role in shaping the underwater soundscape.

If you manage offshore platforms, shipyards, coastal energy projects, or maritime operations, you already know noise isn’t just a nuisance—it’s a compliance, safety, and sustainability challenge. Underwater Radiated Noise (URN) contributes to:

• Stress in marine life, from lobsters to whales.
• Operational risks tied to cavitation and vibration.
• Tougher environmental regulations in coastal waters.

Ignoring this growing issue can delay permits, spark community complaints, and harm ecosystems.

The Acoustic Solutions Advantage

At Acoustic Solutions Pte. Ltd., we turn noise into actionable insight. Our team provides:

• Custom mitigation strategies beyond barriers—targeting cavitation, vibration, and propulsion noise.
• Compliance-focused consulting aligned with Lloyd’s notations and emerging URN policies.

The result? Safer operations, smoother compliance, and a reputation for sustainable maritime leadership.

Partner with us to reduce your acoustic footprint while boosting compliance and performance.