Magnet fishing, also called magnetic fishing, is searching in outdoor waters for ferromagnetic objects available to pull with a strong neodymium magnet. Recovered items may be dangerous, such as firearms, ammunition, and bombs.
A pair of bolt cutters collected through magnet fishing in the Scarpe at Lallaing, France
A neodymium magnet used for magnet fishing
Typical magnet fishing equipment, including protective gloves, a bucket for storing catches, antibacterial hand gel, and a neodymium magnet attached to a rope.
Street sign pulled out of the Jizera in Svijany, Czech Republic, with the magnet used to retrieve it still attached to the signpost.
A neodymium magnet (also known as NdFeB, NIB or Neo magnet) is a permanent magnet made from an alloy of neodymium, iron, and boron to form the Nd2Fe14B tetragonal crystalline structure. They are the most widely used type of rare-earth magnet.
A Nickel-plated neodymium magnet on a bracket from a hard disk drive
Nickel-plated neodymium magnet cubes
Left: high-resolution transmission electron microscopy image of Nd2Fe14B; right: crystal structure with unit cell marked
Neodymium magnets (small cylinders) lifting steel spheres. Such magnets can lift thousands of times their own weight.