A 1965 Amphicar driven by Dean Baker of Lake Havasu, Arizona heads out for a trip to Hoover Dam during the first Las Vegas Amphicar Swim-in at Lake Mead near Las Vegas, Nevada October 9, 2015. The German-made Amphicar was produced from 1961-1968. (Photo by Steve Marcus/Reuters)





James Spear of Henderson, Nevada is reflected in a rear-view mirror as he operates a 1964 Amphicar 770 during the first Las Vegas Amphicar Swim-in at Lake Mead near Las Vegas, Nevada October 9, 2015. (Photo by Steve Marcus/Reuters)





A 1963 Amphicar (L) driven by Rob Vondracek of Fountain Hills, Arizona, and a 1965 Amphicar driven by Dean Baker of Lake Havasu, Arizona head to Hoover Dam during the first Las Vegas Amphicar Swim-in at Lake Mead near Las Vegas, Nevada October 9, 2015. (Photo by Steve Marcus/Reuters)





James Spear (L) of Henderson, Nevada and Josh Garrett of Placerville, California ride in a 1964 Amphicar 770 during the first Las Vegas Amphicar Swim-in at Lake Mead near Las Vegas, Nevada October 9, 2015. (Photo by Steve Marcus/Reuters)





A Panther WaterCar is shown during the first Las Vegas Amphicar Swim-in at Lake Mead near Las Vegas, Nevada October 9, 2015. The Panther can reach speeds of 44 mph (70.8 km/h) on the water, according to the company's website. (Photo by Steve Marcus/Reuters)





Angela Panna of Florida takes photos from the back of a 1963 Amphicar during the first Las Vegas Amphicar Swim-in at Lake Mead near Las Vegas, Nevada October 9, 2015. (Photo by Steve Marcus/Reuters)





Bob Davis of Bullhead City, Arizona drives a Panther WaterCar during the first Las Vegas Amphicar Swim-in at Lake Mead near Las Vegas, Nevada October 9, 2015. (Photo by Steve Marcus/Reuters)





A 1963 Amphicar, driven by Rob Vondracek of Fountain Hills, Arizona, passes by a sightseeing paddleboat during the first Las Vegas Amphicar Swim-in at Lake Mead near Las Vegas, Nevada October 9, 2015. (Photo by Steve Marcus/Reuters)





A Panther WaterCar (L) driven by Bob Davis of Bullhead City, Arizona and a 1963 Amphicar, driven by Rob Vondracek of Fountain Hills, Arizona, float in Lake Mead near Hoover Dam during the first Las Vegas Amphicar Swim-in near Las Vegas, Nevada October 9, 2015. (Photo by Steve Marcus/Reuters)





A 1965 Amphicar driven by Dean Baker of Lake Havasu, Arizona heads toward Hoover Dam during the first Las Vegas Amphicar Swim-in at Lake Mead near Las Vegas, Nevada October 9, 2015. (Photo by Steve Marcus/Reuters)





A Panther WaterCar (L) driven by Bob Davis of Bullhead City, Arizona and a 1963 Amphicar, driven by Rob Vondracek of Fountain Hills, Arizona, float in Lake Mead near Hoover Dam during the first Las Vegas Amphicar Swim-in near Las Vegas, Nevada October 9, 2015. (Photo by Steve Marcus/Reuters)





A custom license plate is shown on the back of a Panther WaterCar during the first Las Vegas Amphicar Swim-in at Lake Mead near Las Vegas, Nevada October 9, 2015. (Photo by Steve Marcus/Reuters)





A 1963 Amphicar, driven by Rob Vondracek of Fountain Hills, Arizona, heads back to the marina after a trip to Hoover Dam during the first Las Vegas Amphicar Swim-in near Las Vegas, Nevada October 9, 2015. (Photo by Steve Marcus/Reuters)





The Baker family of Lake Havasu, Arizona, head back to the marina in their 1965 Amphicar during the first Las Vegas Amphicar Swim-in at Lake Mead near Las Vegas, Nevada October 9, 2015. (Photo by Steve Marcus/Reuters)





Water splashes against the front of the Baker family's 1965 Amphicar during the first Las Vegas Amphicar Swim-in at Lake Mead near Las Vegas, Nevada October 9, 2015. (Photo by Steve Marcus/Reuters)





James Spear of Henderson operates a 1964 Amphicar 770 during the first Las Vegas Amphicar Swim-in at Lake Mead near Las Vegas, Nevada October 9, 2015. (Photo by Steve Marcus/Reuters)





Hannah Baker, 9, of Lake Havasu, Arizona dangles her feet on the side of the family's 1965 Amphicar during the first Las Vegas Amphicar Swim-in at Lake Mead near Las Vegas, Nevada October 9, 2015. (Photo by Steve Marcus/Reuters)





A speedboat passes by a 1963 Amphicar, driven by Rob Vondracek of Fountain Hills, Arizona, during the first Las Vegas Amphicar Swim-in at Lake Mead near Las Vegas, Nevada October 9, 2015. (Photo by Steve Marcus/Reuters)





A kayaker looks over a 1965 Amphicar, driven by Dean Baker of Lake Havasu, Arizona, during the first Las Vegas Amphicar Swim-in at Lake Mead near Las Vegas, Nevada October 9, 2015. (Photo by Steve Marcus/Reuters)





A 1965 Amphicar (L) driven by Dean Baker of Lake Havasu, Arizona, and a 1963 Amphicar, driven by Rob Vondracek of Fountain Hills, Arizona, drive out of Lake Mead during the first Las Vegas Amphicar Swim-in at Lake Mead near Las Vegas, Nevada October 9, 2015. (Photo by Steve Marcus/Reuters)





A 1964 Amphicar driven by James Spear of Henderson, Nevada is shown on the boat launch after a trip to Hoover Dam during the first Las Vegas Amphicar Swim-in at Lake Mead near Las Vegas, Nevada October 9, 2015. (Photo by Steve Marcus/Reuters)





Propellers are shown on a 1964 Amphicar during the first Las Vegas Amphicar Swim-in at Lake Mead near Las Vegas, Nevada October 9, 2015. (Photo by Steve Marcus/Reuters)





James Spear of Henderson, Nevada drives his 1964 Amphicar out of Lake Mead after a trip to Hoover Dam during the first Las Vegas Amphicar Swim-in at Lake Mead near Las Vegas, Nevada October 9, 2015. (Photo by Steve Marcus/Reuters)





A 1965 Amphicar (L) driven by Dean Baker of Lake Havasu, Arizona, and a 1963 Amphicar, driven by Rob Vondracek of Fountain Hills, Arizona, float in Lake Mead near Hoover Dam during the first Las Vegas Amphicar Swim-in near Las Vegas, Nevada October 9, 2015. (Photo by Steve Marcus/Reuters)