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You decide to send out a lone pikmin to investigate the spot- though an orange pikmin would be the best, due to their ability to fly, yellow pikmin have more sensitive ears and are better at detecting things underground. When the orange flying overhead doesn't trigger anything; you instead send out a daisy chain of orange carrying a yellow with greens to grapple them away in case something goes wrong. Yellow are the most lightweight, so that also helps. In the meanwhile, you divy up the bombrocks you prepared for this located nearby to your orange pikmin as flying bombers. Once the yellow pikmin touches down, nothing happens for a moment until it starts to dig up the place where the part's signal is strongest...