The High Dive
The high dive ia an unflinching leap made off the lip The Yak'koli Oculus to land on The Fallen Chandelier at the bottom of the ventricle. Cold crosswinds from the river below and the blazing sun above can cause unexpected turbulence, and while deaths are rare, they're still common enough for everyone to recall the recent ones.
As far as a skydive, yet entirely enclosed within Yak'koli. You can live here your entire life without ever realizing how truly vast the ventricle is. Plummeting through it at terminal velocity for several unending minutes is truly humbling.