A 32-year-old man is brought to the Emergency Department after high-speed blunt polytrauma. He has a Glasgow Coma Scale score of 3 and is peri-arrest. You are leading the trauma team. Tracheal intubation has failed despite three optimised attempts with senior anaesthetic consultant support. Oxygen saturations are falling despite high-flow oxygen. The anaesthetic team declares failed tracheal intubation, and the emergency front-of-neck airway kit is immediately accessible.

What is the most appropriate immediate next step in airway management? Select only one best single option.