Early on, to attract tourists, people dug holes in the trunks to let the carriage pass through the living trees, but the redwood tree, although tall and thick, its root system is very shallow. People keep coming closer to their trunks, pressing the soil near the roots, affecting the roots to absorb water and nutrients, let alone let the carriages run back and forth! In the cold winter of early 1969, the big tree that could allow the carriage to pass by Wawona Tree fell and died. Now there is another similar tree called "California Tree" in MariposaGrove, which was dug in the trunk early, but the hole is slightly smaller and has not fallen yet. Today, these world masters are protected by law, needless to say, digging holes, scraping its bark, or collecting its pine nut balls is illegal. People realize that a healthy world master is more valuable than a world master who is dug to attract tourists.