The quite simply irreplaceable Mike from our community of research, diving medicine and beyond. His wisdom, friendship, advice and huge sense of humour will be missed by all who knew him – from sharp insightful comments and exchanges in a review, to outrageous jokes at the bar late at night, it will never be the same again. We are all shocked and deeply saddened. Most sincere condolences to Mike’s wife and family for such a deep loss.