Astronauts Harrison Schmitt (left) and Eugene Andrew Cernan practice taking geological samples at the Kennedy Space Center in Florida, in preparation for NASA's scheduled Apollo 17 lunar landing mission, on August 28, 1972. Schmitt is the Lunar Module Pilot and Cernan is the mission's Commander. They are training for their period of EVA (extravehicular activity) on the Moon. (Photo by Space Frontiers/Getty Images)

A man reacts as he holds the equipment used by Palestinian cameraman Hussam al-Masri, who was a contractor for Reuters, at the site where he was killed along with other journalists and people in Israeli strikes on Nasser hospital, in Khan Younis in the southern Gaza Strip, in this still image taken from a video shot by Reuters contractor Hatem Khaled, who was wounded shortly afterwards in another strike while he was filming the site on August 25, 2025. (Photo by Hatem Khaled/Reuters)

A supporter of former US President Donald Trump waits outside of Trump's President Day event at the Hilton Palm Beach Airport in West Palm Beach, Florida, on February 20, 2023. (Photo by Giorgio Viera/AFP Photo)

A soldier supporting anti-government opposition groups carries a rocket-propelled grenade launcher on a street in the Fagah area of Mogadishu, Somalia Sunday, April 25, 2021. Gunfire was exchanged Sunday between government forces loyal to President Mohamed Abdullahi Mohamed, who signed into law on April 14 a two year extension of his mandate and that of his government, and other sections of the military opposed to the move and sympathetic to former presidents Hassan Sheikh Mohamud and Sharif Sheikh Ahmed. (Photo by Farah Abdi Warsameh/AP Photo)

A rickshaw puller waits for customers during heavy rainfall in Kathmandu, Nepal, 28 May 2021. As Government stricken nationwide lockdown from 28 May 2021 to control coronavirus disease (COVID-19) infection and deaths, low-income families are struggling to cater for their daily lives. (Photo by Narendra Shrestha/EPA/EFE)

Models prepare backstage ahead of the “Romance Was Born” show during Afterpay Fashion Week Australia Resort 22 Collections at Carriageworks on May 31, 2021 in Sydney, Australia. (Photo by Jessica Hromas/The Guardian)

Youths, who covered themselves from head to toe in silver paint to become “manusia silver” (silvermen), as part of their act to make a living, laugh as they ride on the back of a truck in Jakarta, Indonesia, March 31, 2021. (Photo by Willy Kurniawan/Reuters)

Lake Baikal is the world's oldest lake, at 25 million years (possibly older), and deepest, averaging 744.4 metres (2,442 ft).

Located in the south of the Russian region of Siberia, between Irkutsk Oblast to the northwest and the Buryat Republic to the southeast, it is the most voluminous freshwater lake in the world, containing roughly 20% of the world's unfrozen surface fresh water.