A vertical wind tunnel for raising persons by use of air flow, comprising a flight platform (1), an air flow generating device (2) associated with the flight platform (1) and generating a vertical air flow through a channel (3) arranged in a middle of the flight platform (1). The flight platform (1) comprises a safety mattress (4) positioned around the channel (3); a net assembly (5) comprising a flexible net ring (6) and a net (7). The flexible net ring (6) is positioned around the channel (3) and above the safety mattress (4). The vertical wind tunnel further comprises an upholstery ring (8) arranged above the flexible net ring (6) for further absorption of impacts. The present invention increases a safety of its users effectively absorbing impacts of falling flyers.