The standard English idiom for an action that releases many unexpected problems, based on Pandora’s Box, is “open Pandora’s box.”
The expression describes starting a process that produces numerous complicated or harmful consequences that are difficult to reverse. It is used in journalism, politics, law, science, and everyday conversation. The phrase usually emphasizes unintended consequences rather than simple curiosity.
The idiom comes from the later popular form of the Greek myth, in which Pandora opens a container and releases troubles into the world. Ancient Greek versions associated with Hesiod describe a jar or storage vessel, not a box. English translations and later retellings helped establish “Pandora’s box” as the familiar wording. “Open the floodgates” is a related metaphor, but it does not specifically refer to Pandora or to the mythological vessel.