Oxigen Tank. Here is the "original" detail from the film. I called it "Oxigen Tank" because I don't know it's original function in the film so I gave it a name for reference. It seems to me to have such a function. It's the best image I have of it.
Sonar_original.jpg
Sonar_original.jpg
Sonar1.JPG
Sonar1.JPG
Sonar2.JPG
Sonar2.JPG
Sonar3.JPG
Sonar3.JPG
Sonar4.JPG
Sonar4.JPG
Sonar5.JPG
Sonar5.JPG