piilotetuissa
Piilotetuissa is a Finnish grammatical form that represents the inessive plural of the past participle piilotettu, meaning hidden. As a participial adjective, piilotetuissa describes something that is hidden and agrees with a plural noun in number and the inessive case. Because it is a case-inflected form, it is not a standalone noun but part of a larger noun phrase.
The word is typically used with a following plural noun in the inessive case to indicate location
Etymology and grammar: piilotettu is formed from the verb piilottaa (to hide) and its past participle suffix,