This video from South Africa says about itself:
Dylan Irion, Swimming Behaviour of the Common Smoothhound Based on Accelerometer Data
A thorough understanding of the behaviour and habitat use of sharks is critical for improving our understanding of the movement ecology and thus the effective conservation of these threatened species. Direct observation of sharks is often difficult to accomplish in the marine environment where access to free-swimming individuals can be restricted by numerous factors.
The miniaturisation and reduced costs of producing sensors for bio-logging has provided several solutions to overcome this obstacle. The accelerometer is a sensor that functions by recording changes in acceleration due to the dynamic motion of a body, and the static acceleration caused by gravity.
In this study I demonstrate the potential for utilising tri-axial accelerometry as a method for characterising the movement of sharks. By attaching accelerometers to captive common smoothhound sharks (Mustelus mustelus) and comparing the accelerometer record to visual observations of their behaviour, I was able to detect tail beat frequency, tail beat amplitude, and body posture.
Translated from NOS TV in the Netherlands:
Update: Monday 24 Feb 2014, 13:48
On Vlieland, a living shark, more than a meter in size, has beached. Never before such a large shark had washed up [alive] on the Dutch coast. It is a starry smooth-hound shark normally only found in warmer seas.
Hikers found the exhausted shark yesterday on the beach. The fish is injured on its muzzle. It was put back into the sea, but kept beaching again and again. That’s why people brought it to the aquarium in the nature center De Noordwester on Vlieland.
The starry smooth-hound shark is not dangerous to humans. It has no teeth and only eats crustaceans such as shrimps.
According to Dutch daily Algemeen Dagblad, the shark shows signs of recovery.
See also here.
Sharks beaches on Vlieland: here.