漬からされてた＝漬からされていた＝漬からせられていた

Verbs often have two causatives, one in ～す and one in ～せる. ～す is considered more informal these days, but I think it's the original. So this is the past of the passive causative form.

漬からされてた＝漬からされていた＝漬からせられていた

Verbs often have two causatives, one in ～す and one in ～せる. ～す is considered more informal these days, but I think it's the original. So this is the past of the passive causative form.

'has been caused to be submerged,' literally