Using the engineering design process, students will design, build, test and improve a crew exploration vehicle capable of carrying two 2-centimeter-tall "passengers" and floating in water for one minute without leaking. Materials Design a CEV Challenge Worksheet - Download PDF Plastic tubs for splashdown tests (plastic shoeboxes, dishpans, etc.) Towels (paper or cloth) Non-permanent ink pens Supplies for building the Crew Exploration Vehicle (CEV): Cotton balls Cardboard Cardstock (index cards)