See typical Torpedo Net Installation in Figure 6. Part of net can be seen above water attached to numerous flotation buoys along net line and large buoy (Mark II) on far end
Typical Mooring Anchors which held the net in place and which were connected to the end Mark II buoy are shown on horns of Net Tender AN-32 in Figure 4. Sailor is standing on a steel anchor. 2 concrete cement anchors are on each side of him. They usually weighed about 6000 lbs each. However, in some installations heavier concrete anchors were used.
Net Tenders worked with 3 different types of Nets:
Submarine Nets (Type S)
Torpedo Nets (Type T)
Ships Protective Net (Type ISP)
The function of these nets were to block Submarine attacks. A Submarine Net had to either block submarines attempting to enter a port or, if they burst through the net, cause their immediate destruction by revealing them to net Patrol Craft.
See Figure 7 which shows a Submarine Net.
This was the heaviest, most massive net used. It was installed at major bases and ports where concentration of merchant shipping and probability of attack justified the necessarily heavy expenditure of material required in constructing this type of net. This type of net properly installed and maintained provided the highest degree of security from submarine attack essential for a major fleet base where otherwise ships would be particularly vulnerable.
It was in effect, a wire fence securely attached to the ground and equipped with a closely guarded gate. The fence, that was the net proper, was suspended from buoys floating on the surface which in turn were secured at intervals by chains running from Mark II buoys to heavy anchors on the bottom. The gate was a net which could be opened to let friendly ships pass through. It was operated by a barge type vessel called a Net Gate Vessel (Designated YNG). See Figure 8..
The Submarine Net was constructed with diagonal mesh in lengths called PANELS, measuring 300 feet. Nets were tailored to fit the depth of the water where they were to be installed and had to reach the bottom without excessive width which would foul the bottom and possibly impair the functioning of the net under attack.
2 PANELS attached together formed a SECTION.
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