News is reporting that Aleksander Doba has passed today while climbing Kilimanjaro. I can’t find English-language news confirming this, but his wikipedia page has already been updated. Aleksander Doba - Wikipedia He was definitely an adventurer!
Summary from Wikipedia
Aleksander Doba (9 September 1946 – 22 February 2021) was a Polish kayaker known primarily for his long voyages crossing oceans. In 2010 and again in 2013 he kayaked across the Atlantic Ocean westward under his own power. The two voyages were the longest open-water kayak voyages ever made. He was named 2014 Adventurer of the Year by National Geographic. In 2017 he completed an eastward kayaking trip across the Atlantic. He died while climbing Kilimanjaro.