After the discovery of the glowworm caves, Wilson Campbell and Lawson Burrows, their company Fiordland Travels abandoned their trips to the Hidden Lakes and focused entirely on the caves. Continuing the improvements, they dammed the lower part of the cave and put a flat-bottom boat on the stream to take tourists to the waterfall. They installed a ladder up the waterfall, built walkways and bridges, and put electric lights in the cave. Outside, they built a bridge over the Tunnel Burn and a jetty for the boats bringing tourists from Te Anau.