We went for the glacier exploration boat tour, the only one of its kind in New Zealand, cruising around the Tasman Glacial Lake. It is a surreal and mesmerising experience in a totally unique environment. According to our guide, every day is a different day out here, even for the guides themselves — the conditions are constantly shifting.
The tours are built to give you both the thrill and the learning. Our guide was exceptional. He showed us the various types of icebergs and explained how the climate is taking its toll on the glaciers, and we saw with our own eyes the impact of global warming melting and calving the Tasman Glacier at a staggering rate.
The Tasman Glacier is now roughly 23.5 km long and 600 m deep at its deepest point, compared with 28 km for most of its recorded history in the 20th century. In 1973 it had no terminal lake at all; by 2008 Tasman Lake was 7 km long, 2 km wide and 245 m deep. The lake is expected to reach its maximum size within 10 to 19 years, and the glacier will eventually disappear.