A 28-year-old man is brought to the trauma bay after a stab wound to the left anterior chest at the 5th intercostal space. He is alert, BP 110/72, HR 102/min, RR 24/min. Breath sounds are absent on the left side. Percussion note is hyperresonant on the left. Trachea is midline. What is the most likely diagnosis, and what is the immediate next step?

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