Braving the dark depths

15th May 2009 at 01:00

A Welsh teacher dubbed "the extreme frogman" has become the first person to explore more than 500m of Canada's deepest cave. Dr Martin Groves, who teaches maths at Llanishen High School in Cardiff, has returned from a Pounds 10,000 expedition during which he braved freezing temperatures in the depths of Castleguard cave in Alberta. With six others, he skied 15 miles up a glacier to reach the cave. Carrying 70kg of equipment, he reportedly only turned back when he ran out of rope. He said he felt apprehensive beforehand, "because it had been a year in the planning, and a lot of people had dedicated time and money. The real satisfaction came when I was mapping what I'd found. It was very demanding, but we pulled it off," he told a local newspaper. He plans to return next year to investigate more of Castleguard's 25km of tunnels.

Log-in as an existing print or digital subscriber

Forgotten your subscriber ID?


To access this content and the full TES archive, subscribe now.

View subscriber offers


Get TES online and delivered to your door – for less than the price of a coffee

Save 33% off the cover price with this great subscription offer. Every copy delivered to your door by first-class post, plus full access to TES online and the TES app for just £1.90 per week.
Subscribers also enjoy a range of fantastic offers and benefits worth over £270:

  • Discounts off TES Institute courses
  • Access over 200,000 articles in the TES online archive
  • Free Tastecard membership worth £79.99
  • Discounts with Zipcar,, Virgin Wines and other partners
Order your low-cost subscription today