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It's obviously not as simple as cutting a hole in the deck after it's built. It must be solid to walk on so it needs to be figured into the framing and foundation plan of the future deck. Flush to walk on? More framing to support the hatch from inside the basement. Water tight? Yes, the hatch leads into the house. The surest way to make it water and bug tight is a framed hatch that over hangs a curb and weather stripped. The basement curb needs to be constructed after the deck top elevation is established. The deck boards need to be fastened firmly to the hatch so plywood, water proof membrane and flashing first. The last thing involved is cutting the hatch opening. Then it can be hinged and hatch handle installed. The hatch will be quite heavy by then and need lifting assistance. There are several ways to flush hinge it, that's the easy part
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