1. Direct cause: When Senna crashed, the suspension arm that broke off the right front wheel popped out and hit Senna's head. One of the suspension arms directly penetrated Senna like a harpoon. The helmet he was wearing was inserted into his skull. At 6:30 pm that day, Senna was already brain dead. At 6:40 pm, four hours after the accident, the hospital declared Senna dead. He was only 34 years old.

2. The cause of the accident:

According to the subsequent investigation, the cause of Senna's death is generally considered to be the following three points:

1. Because of the game that day A series of collisions occurred while running, and the organizer dispatched the safety car (Safety

Car) to guide all the cars around. They did not return to the pits until the fifth lap. Because the safety car was deployed for too long, The car is running at low speed for a long time, causing the car's tires to fail to reach operating temperature and the tire pressure to drop, making the car's chassis and the ground closer than normal. When Senna's car passed the fatal corner, the chassis began to touch the ground. The airflow under the car was interrupted and the car body slid on the ground, which caused the car's grip to decrease sharply, causing the car to lose control.

2. Before the race that day, Senna kept complaining to the team that the steering wheel of the car was too heavy, which made it difficult for him to control the car. However, he could not find a suitable part at the moment, which was a longer steering wheel steering shaft. , so the team technicians saw off the steering shaft and then welded a smaller steel pipe to lengthen it. Unexpectedly, it broke during the race. As a result, when an accident occurred, Senna was unable to save the out-of-control car. Although it was later discovered that the steering wheel steering shaft of the accident car was broken, the data from the racing recorder showed that the steering shaft was broken.

3. Due to the accident at the start, some car debris remaining on the track has not been completely cleared. When Senna's car passed the accident site, the air flow was involved in the debris and hit the steering system, causing the car to lose control. .