A little salt. A very different sound.

Why does the ocean
sound so creepy?

Strike a gong. Change the water. Hear what stays.

About this experiment

A man strikes a small brass gong, then dips it into a tank. In fresh water the ring dies almost instantly. Add salt — about 3.5 percent, like the ocean — and the low frequencies linger. This page synthesizes that gong in your browser (no recorded samples) so you can hear and see the caricature: salt water lets lows travel farther.

Inspired by the YouTube Short by @Nyvraexplains, crediting Daniel Thieme. Simplified physics, labeled as a teaching demo — not a hydrophone lab model.

Headphones recommended · Sound starts on click
01 / Try it yourselfWEB AUDIO

Listen to the difference.

Strike, submerge, then add a little salt.

Fresh waterOcean ~3.5%

Click Strike to start the Web Audio engine.

The hydrophone tankIn air

Air — long decay, full spectrum

Live spectrum

Lows surviving in salt vs dying in fresh
Low frequenciesHigh frequencies
01

Air

The brass disc rings with inharmonic partials and a long sustain. Energy across the spectrum fades slowly — especially the lows.

02

Fresh water

Submerged, the gong couples into a dense, highly damping medium. In this demo even the lows collapse within a fraction of a second — matching the “ring dies instantly” tank test.

03

Salt water / ocean

Highs are still swallowed, but low frequencies persist as a darker drone. Real oceans carry rumble and whale song for vast distances; this slider is a cartoon of that idea.

Ask why it sounds that way

After you sign in with ChatGPT, this panel streams an explanation through the app proxy. Tokens stay on the server.

Checking ChatGPT session…