The Aorta artery.
Its the main hose straight from the heart.
Sadly many people develop a weakening at some part of this pipe, just like a water main, if can develop a split and slowly leak before it ruptures. Its called an Abdominal Aortic Aneurysm, or AAA for short.
If it does rupture, you have two minutes to say your goodbyes, before you become unconcious and die.
The other "members" will try talking you out of it....do not give them your location.