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STIR boiling water into dry gelatin mix in large bowl at least 2 min. until gelatin is completely dissolved. Add enough ice to cold water to measure 1-1/2 cups. Add to gelatin along with the lime juice; stir until slightly thickened. Remove any unmelted ice. Refrigerate 10 min. or until thickened (spoon drawn through leaves definite impression).
SPRINKLE 1 cup of the crushed pretzels onto bottom of 1-1/2-qt. serving bowl; set aside. Remove half of the gelatin; set aside. Add half of the whipped topping to remaining gelatin; stir with wire whisk until well blended. Spoon over pretzels in bowl. Refrigerate 5 to 10 min. or until set but not firm (gelatin should stick to finger when touched).
SPOON remaining gelatin over creamy layer. Refrigerate 3 hours or until firm. Top with the remaining whipped topping and the remaining 1 cup crushed pretzels just before serving.