Subsea marker
Subsea markers are passive identification markers used underwater to identify equipment or a designated workspace. As subsea equipment may be covered in underwater growth like seaweed, kelp and algae, special non-fouling materials are sometimes utilized for equipment marking to ensure these are readable even after prolonged periods of submergence.
Some subsea markers are made from a durable rubber which has been manufactured to include synthetic oils. The oil is evenly distributed through the material and gives the material excellent hydrophobic properties. The hydrophobic properties of the material prevent marine growth from attaching to the surface of the marker making it readable even after several years of submersion under water.