Practical Engineering - Repairing Underground Power Cables Is Nearly Impossible

• What challenge does electrical arcing cause that overhead power-lines solve?

• What challenges do underground lines face?

• What is a high pressure fluid filled (HPFF) cable? How does it work?

• Explain how the Scattergood line used fluid pumps to control heat.

• Explain what went wrong with the LA power line that caused it to need to be replaced.

• What role did liquid nitrogen play in the proposed fix?