Most deaths that occur in a triathlon happen in the swimming phase.
A detailed report on triathlon deaths can be found in a recent issue of the Annals of Internal Medicine.
There were 135 sudden deaths,resuscitated cardiac arrests and trauma related deaths recorded in the period 1985 to 2016.
90 occurred in the swimming phase,7 in the bike phase,15 in the running phase and 8 in the post race period.
85% of the events occurred in males and the average age of death was 46.7 plus.minus 12.4 and the risk of death was greatest in participants over age 60.Almost 40% of the events occurred in first time participants.
One of the co-authors, Dr Larry Creswall,who writes the blog " Athlete's Heart Blog" discusses the results and offers suggestions for way to improve safety and response to incidents. See here