In the Netherlands, if you have employees who work in enclosed spaces (cellars, cooling cells, sea containers), you must protect them against suffocation, intoxication, poisoning or fire. If you suspect a hazardous situation in such a space, you must arrange for a gas measuring expert to measure the possible presence of certain substances. Employees may only access the space after measurements have shown that there is no danger.
In the construction sector you must have a Health and Safety Plan (Veiligheids- en gezondheidsplan, V&G-plan) in place for work performed in enclosed spaces. The company emergency response plan must include measures to prevent certain dangers. In addition, an immediate manager must inform and instruct employees about dangers, measures and procedures.