squeeze through the cracks

Translations
протиснуться через щели
Despite the strict regulations, some unqualified applicants managed to squeeze through the cracks.
Несмотря на строгие правила, некоторым неквалифицированным кандидатам удалось протиснуться через щели.
Definitions
To manage to avoid being noticed, caught, or dealt with, often by escaping attention or oversight; typically refers to someone or something that evades rules, regulations, or scrutiny due to gaps or weaknesses in a system.