Directions:
PREPARE cake batter and bake in 13x9-inch baking pan as directed on package. Cool completely.
INVERT cake onto large platter; remove pan. Using a serrated knife, cut and scoop out a shallow rectangle from center of cake, leaving a 2-inch border of cake on all sides and a thin layer of cake on the bottom. Reserve removed cake for snacking.
STIR boiling water into gelatin in large bowl until completely dissolved. Stir in cold water. Refrigerate about 1-1/4 hours until slightly thickened (the consistency of unbeaten egg whites). (Or, see Tip below for a quicker set method.) Pour thickened gelatin into center of cake. Refrigerate 3 hours or until set.
FROST borders of cake with whipped topping. Decorate with remaining ingredients as desired to resemble a swimming pool. Store in refrigerator.
KITCHENS TIPS
Fun Idea
Insert gummy fish and octopus candies into gelatin "pool" before refrigerating for an added treat!
Take a Shortcut
For a quick-set gelatin, simply add 4 cups ice cubes to the dissolved gelatin mixture in place of the 1 cup cold water; stir until gelatin begins to thicken, about 8 minutes (spoon drawn through leaves a definite impression). Remove any unmelted ice. Pour thickened gelatin into center of cake; continue as directed.
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