Ocean & Marine · Recorded milestone
Active sonar
Recorded year1918
ASDIC sends sound pulses to find submarines, later mapping the seafloor.
Explore this milestone on the interactive mapBuilt on
Led to
- Echo-sounding seafloor surveyRecorded · 1925enables
- Nuclear submarineRecorded · 1954enables
- Medical ultrasoundRecorded · 1958enables
- Deepest diveRecorded · 1960enables
- Plate tectonicsRecorded · 1962enables
- Autonomous underwater vehiclesRecorded · 1995enables
- Shipping steered around whalesForecast · ~2028enables
Sources & evidence
Dataset updated 2026-10-18. This individual record has not been separately re-reviewed.