Although it appears to show it in the sea I wonder how long it would last in a long term salt water test? From the FAQ:
Can you use the Panther in Saltwater?
a. With proper maintenance the Panther can be used in salt water. The Panther is constructed of non-corrosive materials wherever possible but, like any vessel exposed to salt water,it is recommended it be thoroughly rinsed with fresh water after use. A light spray with a lubricant like WD 40 will prevent corrosion.