Underwater Great Wall of China
The Underwater Great Wall may be centered around stationary sensors on the ocean bed, but autonomous unmanned underwater vehicles will be a critical enabler in not just tracking enemy submarines, but finding them. Also note the large AUV's reflection on the display glass.
The Chinese Navy, the PLAN, appears to be following in the footsteps of its sister service, the People's Liberation Army Air Force, in making growing investments in unmanned surface and underwater systems, aka "drones." A new Chinese exhibit shows the scale of the potential future.
One area where unmanned underwater vehicles (UUV) and unmanned surface vehicles (USV) would make a splash is in Chinese anti-submarine warfare (ASW) efforts.