It seems that shark repellent technology is not very effective.
Today’s invention offers some additional safety for surfers.
It consists of a buoyant, carbon fibre surfboard which is made of two layers (blue and pink). Between these, are two fold-out sides as shown in section on the left. (This operates like a fold up shopping crate).
When a surfer sees a threatening shark, he or she opens the box (A) and clambers into the space. This acts as a shark cage.
The cage floats on the surface until a rescue by boat can be effected.