Urban: Air Crash Crashed into the Island, I Started Building a Submarine

The plane crashed into a desert island, and Zhao Qian dug out parts from the wreckage. Others were still drilling wood to make fire, but he relied on the hard-core knowledge he learned from the forum to build a simple submarine in three days. All the people on the passing warship were stunned: I am afraid this guy is not a retired special forces soldier.