Ultimate Adamantium
The so called 'Indestructible metal' of the 616 universe is no longer unbreakable within the Ultimate universe.
Let's look over the facts ...
[list=1]
[*]Wraith states in Ult X-men #3 that it's a 'semi-Indestructible' metal
[*]In issue #11 Wolverine is sealed inside a 'adamantium cage' and fury later states a Iraqi shell blew it to bits
[*]Ultimate Hulk versus Wolverine
[/list=1]
Also how would such a 'Indestructable' metal fit into the Ult universe . If it's supposed to be more realistic a unbreakable metal wouldn't even exist....