In the map, this missile expansion is in the same line as the Tourian elevator. You usually would have to freeze 2 rippers with the ice beam and use the Power Grip to get into the morph ball hole of the upper left corner of the screen! But you need none of them, if you go to the point, which is most to the left and infinite bomb jump to the hole! It requires luck, that the rippers are in a position, where they can´t hit you!
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