Milutin Veljković (born 1935, Zaječar – died 2011, USA) was a Serbian speleologist, electrician, and physics student, best known for setting a new Guinness World Record for the longest consecutive time spent underground (464 days).

[3] He wanted to explore it, but also to break the world record for the longest time spent consecutively underground.

The previous record was held by Henri Fiout, a French man who remained underground for 109 days.

[7] Shortly after this, Veljković also wrote a book based on the diary he kept, which was called Under the Stone Sky.

[9] In 2021, Spanish athlete Beatriz Flamini attempted to break the record set by Veljković.