YOU SAID:
砂浜に隠してた
INTO JAPANESE
砂浜に隠してた
BACK INTO ENGLISH
I hid it on the beach
INTO JAPANESE
ビーチに隠した
BACK INTO ENGLISH
Hidden on the beach
INTO JAPANESE
ビーチに隠された
BACK INTO ENGLISH
Hidden on the beach
That didn't even make that much sense in English.