Sentinel Seabed Frames
The small and lightweight form factor of the Sentinel Diver Detection sonar head enables multiple deployment configurations ranging from cable suspension over the side of a yacht
to permanent seabed mounting in a busy container port or military harbour. One of the most popular methods however is our seabed frame.

Sentinel deployment frames are available as either standard or lightweight versions; both of which allow deployment of the Field Portable Sentinel Sonar Head for expeditionary or temporary installations. Both frames are constructed of high-grade aluminium and have user replaceable sacrificial zinc anodes attached to prevent corrosion. The frames break down into manageable pieces – each weighing less than 8kg – and are easily reassembled. 

Frames are supplied with a single 5kg (11lb) weight per leg, but in difficult environment conditions, such as high current areas, additional weights can be easily added.

An optional mud plate can also be attached to the base of the frame to prevent the system from sinking when deployed on a soft seabed.

Using the deployment strops the frame can be lowered onto the seabed by using a small davit or crane.

Sentinel Scylla Loudhailer
Scylla is an optional module for the Sonardyne Sentinel Intruder Detection Sonar, which adds an underwater audible warning and deterrent capability.

Scylla comprises an underwater speaker and a surface Loudhailer Drive Unit (LDU).

The Scylla system has been designed such that the maximum source level does not exceed 195 dB re 1µPa @ 1 metre. Trials and modelling have shown this sound pressure level is to be disorientating but not dangerous to humans even if divers approach to within one metre of the underwater speaker.

The Scylla can be co-located with the Sonar Head and controlled via the standard 75 metre or 300 metre sonar cable or deployed remotely via a dedicated cable, allowing easy over-the-side use.