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A technical cave diver using a diver propulsion vehicle (DPV) to dive into the Blue Springs state park cave system near Marianna, Florida.

Scuba diver on her underwater propulsion vehicle getting a close-up look at an upside-down jellyfish, Bonaire, Caribbean Netherlands.

Scuba diver navigates the waters using a diver propulsion vehicle off the coast of Bonaire, Caribbean Netherlands.

Scuba diver uses a diver propulsion vehicle to navigate the waters off the coast of Bonaire, Caribbean Netherlands.

Windmills on a wind farm near Zahara de los Atunes, aerial view, drone shot, Cadiz province, Andalusia, Spain, Europe

Alternators, Department of Power Engineering, Deutsches Museum German museum, Munich, Bavaria, Germany, Europe

Revolving-field machine by Siemens and Halske in 1887, Department of Power Engineering, Deutsches Museum German museum, Munich, Bavaria, Germany, Europe

Windmills on a wind farm near Zahara de los Atunes, aerial view, drone shot, Cadiz province, Andalusia, Spain, Europe

Old turbines in the Hydroelectric power station Unesco world heritage Industrial site Rjukan-Notodden, Norway, Europe

Wind turbines illuminated by the sun and forest rising from cloud cover, sunset, Koeterberg, Luegde, Weserbergland, North Rhine-Westphalia, Germany, Europe

Single windmill turbine and small traditional Greek Orthodox chapel or church and road to them in colorful landscape on hilltop against blue sky with some cloulds on clear sunny summer day. Crete, Greece, Europe

Pierre Le Coq carries his windsurfing board over his head on a jetty at Plouguerneau, Brittany, France.

Pierre Le Coq preparing his windsurfing gear on a jetty near his van at Plouguerneau, Brittany, France.