Mad? Well, he is English by birth.
But no. When the world's best freediver, William Trubridge goes out in the midday sun, his ice-cool brain controls a finely tuned body. Whilst his sport may be viewed as "extreme", at its heart is incredible discipline, a relentless search for the body's physical limits.
And for pushing the boundaries, creating the circumstances for his own life, the former Hawke's Bay resident is to be cherished as much as any of his father, David's artistic creations.
Oscar Wilde once wrote: "Most people are other people. Their thoughts are someone else's opinions. Their lives a mimicry, their passions a quotation."
Not the 32-year-old Trubridge.