Zip World in Bethesda will be closed for two days following injuries to two members of staff.
The injuries were sustained on a testing run before the park was open to the public.
The Welsh ambulance service responded to a call at around 8:30 am this morning.
A Welsh Ambulance Service spokesman said: "We were called at about 8.30am to reports that two people had sustained injuries at Zip World in Bethesda.
"Two emergency ambulances attended the scene and two men have been taken to Ysbyty Gwynedd with injuries which are not thought to be life threatening."
Sean Taylor, Commercial Director of Zip World, said: "Our technical team has advised that the Velocity adventure should be closed for two days so that further testing can take place.
"Safety at Zip World is ensured through a combination of technology, training and supervision. We invest in the best equipment and best training on a continual basis to ensure that our participants are kept safe."
The injuries at Zipworld Bethesda come following the death of a man at Zip World Titan in Blaenau Ffestiniog on Saturday September 3.
Sean Taylor, Commercial Director at Zip World, said: “Our thoughts are with the family who lost their loved one following the events of Saturday, when a visitor to our site sadly passed away from natural causes.
“The safety of all customers is our top priority and the moment the visitor became unwell, our staff reacted immediately to assess and treat. This is something they are trained to do and they remained with them until the emergency services arrived on site.
“The staff at Zip World are devastated by Saturday’s events and we closed the site that day as a mark of respect.”