Asterix: Asterix and Obelix All at Sea: Album 30 by Albert Uderzo
The slaves are revolting... they've stolen Julius Casar's own galley. Seeking shelter in the little Gaulish village, they find it in crisis. Obelix has suffered diree effects from drinking the druid's magic potions on the sly. Can his friends get him cured by Absolutlifabulos, high priest of Atlantis? Enjoy all the thrills and spills of sea battles against the Roman navy!