CHICAGO (AP) — The tightrope is waiting for Nik Wallenda in Chicago.

The 35-year-old high-wire artist plans to perform two nail-biting walks that will be televised around the world Sunday.

The Discovery Channel will use a 10-second delay for the broadcast, allowing producers to cut away if Wallenda falls. He plans to perform the walks without a net or harness.

First, Wallenda will walk uphill at a 15-degree angle from the west Marina City tower to the top of a skyscraper on the other side of the Chicago River. Next, he’ll walk between the two Marina City towers wearing a blindfold.

Steven Dahlman lives in the east Marina City tower. He says his neighbors are a little worried, but excited to be “in the middle of a world event.”