Siav was a Vulcan member of Starfleet serving during the 24th century.

He was born in 2341, in the Vulcan province of Xial and his father was a member of the V'Kor

He enlisted in Starfleet as a Plasma Specialist in 2361.

By 2376 he was a Chief Petty Officer and served as the Senior Enlisted Advisor for the USS Defiant, as well as in the Engineering Department.  ("Gatekeeper")

He served as a mentor to Chief Engineer Nog, who often felt overwhelmed.

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