This guy was injured on his rear flank by a propeller. It resulted in what's called a sucking chest wound. Air is entering through the wound, filling the abdominal cavity compressing and collapsing the lung. There looks to also be some broken ribs. What you should do here:

Find some sterile plastic like cling film, put it over the wound and tape it in 3 places so it forms a one way valve.

Suggestion is also that the effected lung should be on the person's downside as it could help prevent the effected lung from completely collapsing under the pressure of accumulating blood in the chest cavity. Keeping the good lung upwards may assist in maintaining its correct functioning. However moving a person in this state is very risky as broken bones could cause more damage, so in this situation, don't move patient, and get the one way valve working and call for professional assistance.