According to the query, Mr Octopus is an animated film, and Xie is a very important role. He is a brave, intelligent and kind biologist with a deep understanding and love for marine life. However, in a mission to help marine life escape, Xie was unfortunately stabbed by a heart-shaped snail and died of poisoning.

This incident brought great sorrow and loss to the entire submarine column. Xie's death also reminds us that when exploring the unknown, we must always be vigilant and never take it lightly.