So Visnu Is Told Karna To Create A Ship Made Of Wood Before Shiva Start Pralay To Destroy Everything To Take Some Good People With Him On Ship For Their Safety Then Karna Start Cutting Dry Wood To Create A Ship After 2 Month He Is Manage To Create A Ship So He Is Need Big Rope To Help Ship Move A Safe Place By Using Visnu Matsya Avatar Then Vishnu Is Told Go To A Cave There He Is Find Sheshnaag A Ten Headed Snake So Karna Is Ask Help From Sheshnaag Then He Is Agree But He Is Now Weak Because Of His Hunger So Karna Is Give Him Some Fruits But His Hunger Is Not Full Then Karna Is Give Him Karna Own Body As Meal So Sheshnaag Is Told Her Is Past Test