By Jung Min-ho
Lotte World Tower has postponed the opening of its observation deck until next month after finding a technical problem with an elevator.
The company said Monday it has delayed the opening of Seoul Sky, an observatory on the 123-story building's 118th floor, to April 3 from Wednesday.
The decision came after a temporary breakdown of its double-deck elevator, known as the Sky Shuttle. According to the company, 39 people were trapped in the elevator Sunday for 25 minutes after it suddenly stopped working on the basement floor.
The company said the malfunction occurred during a special event for its employees and their families, ahead of its official opening.
The people in the elevator were released after facility management workers forced the door open.
Lotte World said it is trying to find the cause of the breakdown.
The Sky Shuttle can take people to the observation deck in just one minute. Lotte World Tower has promoted the deck as the world's highest-placed glass-floor observation platform and the elevator is the world's fastest of its kind.
This is not the first safety problem found in the building. Two years ago, the operation of its aquarium and movie theater were suspended for a few months after a series of issues, including a water leak at the former and mysterious vibrations in the latter.