Benoit Pirenne walks down a winding rubble path in a fjord on Canada's Vancouver Island.
He points toward the water, to a sign that reads, "WARNING: CABLE.
"The cable is going underneath here, and it's going out 800 kilometers in a big loop in the ocean," he says.
The cable connects to a network of scientific instruments deep in the Pacific Ocean. The network is called NEPTUNE Canada. (NEPTUNE stands for North East Pacific Time-Series Underwater Networked Experiments.)