Since ice floats, the deeper water at the bottom remains liquid and slightly above freezing, hence, the turions remain unfrozen and alive in a dormant state.
(the deeper water at the bottom; remains; liquid) (the turions; remain; unfrozen and alive; L:in a dormant state; L:slightly above freezing)
the deeper water at the bottom the turions
remains remain
liquid
unfrozen and alive L:in a dormant state L:slightly above freezing