The teenage boys, who filmed themselves clambering up the crane without any safety equipment, uploaded the video to YouTube last week.
In the video, which has caught the attention of police, viewers can see one of the group dangling off the crane by his arms before pulling himself back up.
Watch for yourself below:
Sutton Metropolitan Police, after watching the video filmed in Wallington, posted a warning on Twitter to all would-be thrill-seekers:
Fingers crossed that teens take heed of that warning.