This is a 625Hz active sonar ping, the type used for long range low resolution seafloor imaging or anti sumbarine ...
Like the classic sonar ping of a submarine created on a synthesiser. From my "signals and similar sounds" pack.
sonar-like sound made from EQ-ing mains hum.
ship horns and seaport atmosphere
A diesel engine boat in harbour. Recorded by myself with ZOOM H4
Passing bikes on hill road rec by Zoom H2
Sound of a bike being pedalled with the bike bell being rung intermittently.
recording of a shopping cart/wagon(?)
grabacion de una silla de metal arrastrando y acomodando. Recording a metal chair dragging and accommodating.
This sound comes from a person sitting down with a thud into a metal folding chair. The chair had some ...
Old metal swings squeaks in playground.