A 32-year-old man presents to the emergency department following a motor vehicle collision with severe left-sided chest trauma. On examination, he has tachycardia (HR 118/min), hypotension (BP 92/58 mmHg), absent breath sounds on the left, and severe respiratory distress. Bedside assessment suggests a large left-sided pneumothorax with haemodynamic compromise. Which investigation is the most appropriate next step?