Not really, but perhaps you mean a booming male Bittern. A four or five times repeated very low sound, usually starting with a slightly higher 'inhale'Marfo wrote:[...One of them sounds like someone is blowing in a bottle but the tone is going up and is wavering. Does this description make sense?
Other birds often audible are Sedge warbler (one of the most prominent), Reed warbler and Water rail. And many more.
The sound of the cam is not very good, so the sounds if the birds are often somewhat distorted.