English "sea"

Hi all:
Kind of off topic at the moment, but I'm trying to find a decent
etymology for the English word "sea" for an assignment in an English
lang. history class I'm taking. So far, all I've got is
Mid.Eng. "see" coming from OldEng. "sæ:", and a list of Germanic
cognates. Anyone know of the original OG form, or an IE cognate? I
saw Latin "saevus" listed as a possibility, but it was from an old,
fairly unreliable source.
Any help would be appreciated.
Thanks
Chris Straughn