Event 7-M. Underwater Sounds #2. Use a plastic food storage bag for this activity, one that can be sealed tight. Fill it partially full of water and use it in place of the glass bowl in the previous event to listen to the ticking clock. Does this event do a better job of showing how sounds are transmitted through water? (Caution: Take care to keep from spilling water. Wipe up any spills at once so as to avoid slippery floors.)