What is the author's tone in Endurance: Shackleton's Incredible Voyage by Alfred Lansing?

The book is crafted with a particularly even and cool tone, reminiscent of a professional journalistic presentation of historical events. Sensationalist language or constructions are entirely absent and the simple, tuned sentences and paragraphs present the exciting and dangerously thrilling expedition in an accessible format, materially contributing to the text's enduring success. The book's opening statements make it clear that the scientific expedition ends in unsuccessful disaster, that the subsequent fight for survival is perilous, thrilling, and ultimately successf