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| English | Russian |
| hitherto unknown | доселе неизвестный (The intriguing statue may lead to further insights as experts enlisted to look at the puzzling piece discovered that it actually sat within "a hitherto unknown, but extensive archaeological site."  coasttocoastam.com ART Vancouver) |
| the vast unknown | бескрайняя неизвестность (The 1960s were a weird decade for UFOs. It was an era when science fiction dealing with the subject was just taking off, mankind was taking aim at the moon, and there was a lot of talk about what lies out there in the vast unknown. mysteriousuniverse.org ART Vancouver) |