Subsea development.

Look closely to find the small yellow shapes surrounding a rectangular yellow box.

The "small yellow shapes" are called subsea trees and they are positioned ontop different wells. The fluids from all these wells are sent to the "rectangular yellow box" which is actually called a subsea manifold.

This subsea manifold then sends all the fluids it collects through flowlines (red line), up the riser to the floating production storage and offloading (FPSO) vessel at the surface.