Poseidon Theatre, Parc Astérix, Dolphinarium at Parc Astérix, France

The Poseidon Theatre is an open-air amphitheatre in Parc Astérix, Plailly, built as a dolphinarium and renamed in 1994. Its main pool measures 45 by 17.5 metres and is 2.5 to 4.5 metres deep, surrounded by stands for 2,000 spectators. Since 2022 it has hosted Les Plongeons de l'Olympe, with a 10.6-metre-diameter pool, a 25-metre tower, two diving boards and a swing called the Icarus swing.

The dolphinarium opened with Parc Astérix in 1989 and hosted dolphin and sea lion shows for over 30 years. It was renamed Théâtre de Poséidon in 1994, when its area was expanded and given a Greek theme. The park announced its closure on 25 January 2021, and the dolphins were transferred to parks in Sweden and Spain. The diving show Les Plongeons de l'Olympe premiered on 4 June 2022.

The show 'Les Plongeons de l'Olympe' premiered on 4 June 2022. Eight divers from seven nationalities play Greeks and Romans in a diving competition staged at Olympia, with Zeus as witness and a judge named Papacrapulos. The theatre was redecorated on an Olympia theme for the production, which took four months to create.

Multiple performances happen each day, so checking the schedule upon arrival helps you plan your visit. Seating provides good views from most locations, though you should prepare for sun exposure or occasional water splashing from the pool.

The venue has a noteworthy transformation behind it: it once housed dolphins and sea lions before becoming a stage purely for human performers. This shift from animal exhibitions to athletic art makes it an unusual entertainment venue within the theme park.