Torpedo (Pool Toy)

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Kids love to launch this projectile at one-another during scuba diving lessons. To get started, you'll need to add some weight - anything small and dense will work - just avoid anything that's prone to rusting. This is crucial in making sure the torpedo's buoyancy is neutral when submerged (i.e., it shouldn't sink or float). A hole at the bottom of the torpedo awaits your chosen ballast, so once you've added it, secure it with a strong adhesive like epoxy.