What activity did the author participate in near the Antarctic Circle?

Near the Antarctic Circle, the author participated in a thrilling activity: walking on the frozen sea ice. This rare opportunity allowed the author and other participants to step directly onto the thick ice that covers the Southern Ocean, experiencing the vast, silent, and surreal beauty of Antarctica firsthand. The experience was both humbling and exhilarating, as it highlighted the continent’s extreme and pristine nature. Standing on the ice, surrounded by a seemingly endless white landscape, reinforced the importance of conserving such an untouched environment, which plays a crucial role in global climate health.

This question related to Chapter 3 English Vistas Class 12th NCERT.
From the Chapter 3. Journey to the End of the Earth.
Give answer according to your understanding.