Here's the official word on the free access week:
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"Shi no Zuma" means Death's Swamp. It does indeed take place at a swamp outpost complete with features like a two-story starting building surrounded by fences, a fishing hut, waste-high water, bridges, and even a huge pit surrounded by the equipment of nefarious scientists. Read the official Call of Duty blog post to learn more about the map's features.
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