Geography of South Korea. South Korea is located in East Asia, on the southern half of the Korean Peninsula jutting out from the far east of the Asian land mass. The only country with a land border to South Korea is North Korea, lying to the north with 238 kilometres (148 mi) of border running along the Korean Demilitarized Zone.
Esprit de corps is a concept found in administrative management theory and was developed by Henri Fayol. Esprit de corps is a sense of group cohesion in the organization and between employees. It is an important concept to keep an organization and employees loyal to each other.
The word tuyau is used in French nowadays to designate the cables (fibre or other) that transport data. Maitres des tuyaux is a common enough ready made expression en French to designate those who master those means of communication (Google, Facebook ou Amazon, named in the quote). You are misreading the text you refer to.