Dr Athol Steward's 400km walk from Raglan to Whanganui was an exciting, informative and - at times - death-defying experience.

Accompanied by his sons Lloyd and Jonathan, who walked 200km each, and supported by wife Lari, who followed them in a campervan, Dr Steward set out to raise awareness about the issue of planned sea-bed mining off the South Taranaki coast.

The 16-day walk, which was a many-faceted experience, will be the topic of a talk at the Sarjeant Gallery next Sunday, February 18, as part of the Speakers for the Sarjeant series, fundraising for the redevelopment of the gallery.

Dr Steward, who works at Whanganui Hospital, will talk about his adventures in a remote, rugged part of New Zealand unknown to most.

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The talk, illustrated by photographs, will range widely to include the issue of seabed mining and the environmental health of the planet. On a related but more personal note he will share his thoughts about healthy eating and the role of exercise.

His experience of the beautiful west coast and marine environment has invigorated Dr Steward in his campaign.

"The terrain was just stunning. We went through dense indigenous forest following old stock tracks.

"We got lost on a couple of occasions and ended up scrambling and falling down mountainsides through the forest on our way to Kiritehere, just outside Marakopa. There are stock tracks that were used in the 1800s and early 1900s and they were the only way of getting through because the forest was so dense."

They went through tunnels at Waikawau (70m) and 90m cliffs that had been hewn with pick and shovel through the mountainsides, to allow stock to access the beach. This was the easiest way of moving the animals because the forest inland was so dense in the late 1800s.

They clambered over rocks and boulders and saw all sorts of things - gannets, terns, endangered crane colonies, seals and penguins, and the extraordinary Elephant Rocks at Tongaporutu, north of New Plymouth.

"There was a surprise around every corner. To be so close to that environment for 16 days made me realise even more how valuable the marine environment is to all of us for many different reasons."

There were a few "incidents," which the talk will reveal. Not only did they swim across two harbours (Kawhia and Aotea) and various river mouths with their 40 litre backpacks, but Dr Steward and son Lloyd also found themselves at the end of one day's walk between the proverbial rock and (in this case) a watery place.

"We got to the end of a very, very long day and near the Waikawau tunnel we came across a cliff [that plunged] 40 feet straight down into the ocean to a rocky platform.

"There was no way we could get across this cliff but we were so close to getting to our destination and it had already been a pretty eventful day. But we weren't going to risk our lives trying to climb this cliff.

"My eldest son Lloyd was with me. We decided the only thing we could do was to dive into the ocean with the waves crashing into the cliff and swim for our lives. Fortunately we got through all the breakers and had to swim 70 or 80 meters out. Once we got beyond that we swam parallel to the coast and got onto land."

â– Speakers for the Sarjeant: Dr Athol Steward; Sunday, February 18 at 4.30pm - tickets $5 from Sarjeant on the Quay or by phoning 06 3490506.