Hundreds of valuable aquatic insects were caught on a timelapse camera hatching from their eggs and plunge into water beneath in south Vietnam.br br Filmed in Binh Duong in January, the video shows the insects, called "Cà Cuống" in Vietnamese or belostomatids in English, hatching en masse. br br They can live on land as well as underwater, and are considered expensive insects because their bodies are used as raw materials to make "essence" that is used in traditional medicine.