Welder at work in a workshop in Marrakesh, Morocco

Caucasian welder working in factory

Microbiologist showering in BSL-4

Scuba divers in a cage observing a Great White Shark (Carcharodon carcharias), Guadalupe Island, Mexico, Pacific, North America

Scuba divers in a cage observing a Great White Shark (Carcharodon carcharias), Guadalupe Island, Mexico, Pacific, North America

Scuba divers in a cage observing a Great White Shark (Carcharodon carcharias), Guadalupe Island, Mexico, Pacific, North America

Bear canister, waterproof and bear safe packed equipment, Glacier Bay National Park, Alaska, USA

Polo player with knee pads, Snow Arena Polo World Cup 2010 polo tournament, Kitzbuehel, Tyrol, Austria, Europe

Scuba divers in a cage observing a Great White Shark (Carcharodon carcharias), Guadalupe Island, Mexico, Pacific, North America

Dummy with the equipment of a mine rescuer

Scuba divers in a cage observing a Great White Shark (Carcharodon carcharias), Guadalupe Island, Mexico, Pacific, North America

Scuba divers in a cage observing a Great White Shark (Carcharodon carcharias), Guadalupe Island, Mexico, Pacific, North America

A young woman walking on a bridge while engaging in the sport of Via Ferrata in Val D'isere, Savoie, France.

Handling nuclear material.

Man cycling up small road through fields near Duxford village, Cambridgeshire, England, United Kingdom

Welder