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A man in a protective suit and mask crawls out of the sewer after research

Close-up, the terrorist in a protective suit and gloves, pours liquid with poison, for infection, in a drainpipe

Man in protective suit and mask crawls out of the sewer after research, front view

Scientist in protective clothing, with a suitcase out of the drain pipe, which took a sample for testing

Laboratory worker in protective suit and breathing apparatus crawls out of the pipe

Scientist in protective clothing, with a suitcase goes into the drain pipe to take samples

Scientist in protective clothing, with a suitcase out of the drain pipe, which took a sample for testing, close-up

A man in a protective suit and mask holds a flask of green liquid in his hands and shows his thumb up on the background of sewage pipes coming out from the factory

Environmental laboratory specialist came to the object in a protective suit and mask in his hands holding a briefcase with equipment and reagents

Environmental specialist in a protective suit and mask took a sample of wastewater water to study the level of pollution

A man in a protective suit takes soil samples into a Petri dish from the sewage treatment plant

A man in a protective suit and a respirator against bacteria and viruses sits by the river next to a mobile laboratory for research

Side view of a man in a protective suit and mask holding a test tube and a pipette with test water on the river after an outdoor accident

Environmental laboratory specialist in protective suit and mask took a sample of water in a test tube for research, close-up

An environmental laboratory specialist in a protective suit and mask stands in the water and measures the level of pollution with the device

A man in a protective suit holds a Petri dish with a sample for plants and looks at the reaction in it after adding the reagent

A man in a protective suit and a respirator in goggles holds in his hands test tubes with reagents and test samples in the open air in an unfavorable area on the river

A man in a protective suit holds a Petri dish with a sample for plants and looks at the reaction in it after adding the reagent, side view against the background of the river