If "scuttled" means "sunk a ship":
* Saved
* Rescued
* Preserved
* Repaired
If "scuttled" means "to move quickly and furtively":
* Strolled
* Ambled
* Sauntered
* Marched
* Walked confidently
If "scuttled" means "to hinder or destroy a plan or project":
* Supported
* Promoted
* Assisted
* Enabled
* Facilitated
If "scuttled" means "to run away quickly":
* Stood one's ground
* Confronted
* Faced
* Remained
To give you the most accurate antonym, please provide the context of how "scuttled" is being used.