The only solution for directional underwater recordings.
The Sonar Surround Directivity Sphere gives omnidirectional hydrophones a directivity close to a supercardioid. Usable up to a depth of 1000m.
Harmonic sound despite directivity. Being close to the human head shape spherical microphones are known for their natural, “humanly” sound perception especially pronounced with multichannel arrays. By directing the hydrophone in a mainly additive way most interferences can be avoided.