I am a customer rep for large oil companies, working in manufacturing of subsea equipment. I mostly deal with control systems, which do exactly as they sound and control the well head, and umbilicals. Umbilicals are basically built on the same concept of an umbilical cord. They are typically thermoplastic hoses and/or steel tubes used for chemical injection lines or high/low pressure lines for valve controls, and electrical cables used for power and for signal. As advances are being made, we are moving toward fiber optics, but they are still fairly cost prohibitive to be in such a harsh environment as the ocean floor.
Here is an example of an umbilical
This is a basic diagram of a subsea field. The umbilicals are the yellow lines that look like little ropes. They typically range from 4" to 8" in diameter, and are several miles long (the longest one I worked on was well over 100,000ft long)
Sorry to drone on. I'm a bit bored working nights with not much going on.
none of the above and all of the above-I am a pastor
I'm a security guard who is attending school to possibly become a pastor. 
