A 45-year-old male construction worker falls 8 metres from scaffolding onto concrete. He is found prone and unresponsive. After performing a log roll with manual in-line stabilisation, primary survey reveals absent breath sounds on the left side, tracheal deviation to the right, distended neck veins, and a heart rate of 135 bpm with blood pressure of 72/40 mmHg. What is the immediate management?