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Acoustic emissions from insects.

More sounds from freshwater insects, producing sounds in the water, sometimes audible above the surface.

A collection of sounds of crickets encountered in Europe.

Here is a recording of a conference concerning Cicadidae of Taiwan, by biologist Chen Chen-Hsiang. Taipei Artist Village, 21 Feb. 2008.

The ears under the water level : tympani are blocked and sounds transits through bone conduction.  There, the audition is much less sensitive than in the air.
So I was trying to catch sounds from water bugs, I began to use home-made hydrophone. It's much better than spending too much time the head in ponds...