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Chapter 1261 - 498 Familiar Operation
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... , part of the tunnel that the Drone had previously dug collapsed, or the passage was blocked by mud and rocks. However, these obstacles were nothing before the Drone’s huge Drill Bit, so the Drone quickly reopened the upward passage.
Compared to the difficulty of drilling downwards earlier, the Drone now found it much easier to return along the same route, at least not consuming as many Energy Points as before. Two days later, the Drone returned to the Persian Gulf waters via the previou ...
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