One of our specialties; making large, complex shaped, thick-walled composite sonar domes in a single production run (out of 1 piece!).
To search underwater, everyone uses sonar technology. There are two types: active sonar and passive sonar. An active sonar emits a sound, the sound collides with an object, then it reflects and with that data you can determine that something is present and where about. A passive sonar does not transmit anything, but only listens to ships or submarines that make noise.
Warships as frigates usually use active sonars because they themselves (hull, machines and propellers) make too much noise to use the passive sonar properly. The under water world is thus a world of sound: the person who is quietest and / or can hear the furthest wins.
In 1999 Holland Composites developed a new technique to produce sonar domes – the excellent spherical part under the fore of large (war) ships such as frigates where the sonar is housed. Until then, sonar domes were either of metal or glued from multiple (composite) parts.