They are "professionals" if such a thing exists.
https://www.yahoo.com/entertainment/general/article/angela-nikolau-and-ivan-beerkus-climb-empire-state-building-and-pull-off-death-defying-proposal-the-skywalkers-couples-stunt-explained-223207750.html
From the article:
"The couple that climbs a New York City landmark together … gets engaged.
The two masked climbers who scaled the Empire State Building on Wednesday have been identified as Ivan "Vanya" Beerkus and Angela Nikolau, stars of Netflix's 2024 documentary Skywalkers: A Love Story.
Beerkus and Nikolau were initially spotted 1,454 feet in the air atop the building's spire, prompting 911 calls to police at around 12 p.m. ET, according to NBC New York. During their death-defying escapade, the duo, dressed in black, unfurled a large pro-peace banner that read, "When the power of love beats the love of power, the world knows peace."
After 30 minutes on the spire, Beerkus and Nikolau climbed down onto a perch, where Beerkus dropped to one knee and proposed to Nikolau. They proceeded with their descent around 10 minutes later. "
More at the link.
= new reply since forum marked as read