Use Key on Platform

Journal
''Kortreek has another job for me. This one is some kind of experiment he wants me to perform. He gave me an iron key and told me to go past Grusk's northwest gate and find a platform on the beach. I'm to use the key to release a kite so it flies higher into the sky. Kortreek said that if anything interesting happens during the experiment, I should open a container on the platform and collect the result for him. I wonder what he means by "interesting"?''