Early Seeker Missiles
From Prime3
Discovered by Paraxade
It is possible to acquire the Seeker Missiles before the Ship Grapple. You need to do a BSJ+SA to enter the window in (room name??).
Paraxade's video, trick is actually found in the first 40 secs : http://www.youtube.com/watch?v=y8ybSApaPKg