This week, construction on a massive suicide-prevention net began at San Francisco’s Golden Gate Bridge.

The net will be suspended 20 feet below the bridge’s pedestrian sidewalk.

Last year alone, 39 people committed suicide by jumping off the iconic structure, though, as NBC Bay Area notes, about 200 deaths were prevented after workers at the bridge intervened.

The net will cost about $200 million, but could save countless lives: Since the bridge opened in 1937, more than 1,500 people have jumped to their deaths from it.