A Bowtie for Endurance Swimming

In the process safety world, development of bowties are part of the toolkit we have at our disposal to communicate how risks around a specific scenario can be managed. I thought I’d give it a go at my pass time of endurance swimming.

I am currently 3 swims into my quest to complete the Oceans 7 challenge, I often get asked about how this pursuit is compatible with my profession in process safety. For those who have not come across the Oceans 7 challenge, it is the swimming equivalent of climbing the 7 highest peaks of the world and includes the English Channel (England-France), The North Channel (Ireland - Scotland), Tsugaru Strait (Japan), Cook Strait (NZ), The Molokai Channel (Hawaii), Catalina Channel (USA) and the, Gibraltar Strait. The rules prohibit use of wetsuits and resting on your support craft. As of 2020, 21 people globally have completed this. The pursuit for me has been parked this year, but it will hopefully resume next year.

The safety question I often get is a valid enquiry, as it can appear to be a daunting proposition for the un-initiated. The swims take anywhere from 5 – 20 hours and hazards of tides, hypothermia, jellyfish and sea conditions are a real threat that leads to many DNFs (did not finish).

I normally respond this ”safety” question by saying that “I train for it” and have “experience” but when it comes down to it,  you cant fully train for the unexpected. I have been doing ultra-swimming for 7 years now and try to soak up all the advice I can get, however it is the “doing” that teaches you the most.

I have always been intrigued how I could “couch” this activity in terms of a bowtie to communicate this to my colleagues and clients.  A bowtie is a technique we use in the high hazard industry to communicate the relationship between the outcomes of undesirable events, their causes and the ways that can be prevented. Have a look at this bowtie and let me know what you think.

The items on the left-hand-side are called causes, that if left untreated, will lead to an undesirable outcome. The barriers reduce the likelihood of the outcome being realised.


After preparing this bowtie, I can make the following conclusions:

  1. I was not aware of several parts of this bowtie when I started out – this was my naivety - experience has changed this.
  2. The causes and effectiveness depend on many human factors and conditions out of your control. This is a big difference to process safety scenarios which tend to be more predictable.
  3. Build your plan around what can go wrong. Communicate this with your team and train them to execute the mitigation plans. You need them to “think” for you.
  4. Train yourself both physically and mentally to deal with the high likelihood that you will move down 2 or 3 of the bowtie “arms” during an event.

This model is by no means complete, but a summary of how I risk manage my events and keep safe.  If anyone has feedback on this bowtie, I'd be happy to chat.