Marine seismic streamer and method for manufacture thereof

A seismic streamer includes a jacket covering an exterior of the streamer. At least one strength member extends along the length of the jacket. The strength member is disposed inside the jacket. Seismic sensors are disposed at spaced apart locations along the interior of the jacket. A flexible, acoustically transparent material fills the space inside the jacket. The material is introduced into the inside of the jacket in liquid form and undergoes a state change thereafter. The strength member, prior to and during the state change, is maintained in substantially a same position with respect to the jacket as would occur during ordinary operation of the streamer. The maintaining position is performed at least at a location along the jacket where a device is to be coupled externally to the jacket.