Strange object floating in the sky in multiplayer level. cheats for Syphon filter 2

Strange object floating in the sky in multiplayer level.

When you unlock the 'Rock mountains' level for multiplayer enter the level with two player and go near the big rock and look up into the sky and zoom out with your scope until you find an object up in the sky then zoom into it and take a look. I have no idea what this is or how it was put there. If anyone knows what it is please message me.

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