This is not your traditional 20,000 Leagues under the Sea. Apparently it's a continuation of a 2023 Spanish language series called Journey to the Center of the Earth.
First off, the entire show is in Spanish. So if you don't understand the language, it's confusing and subtitles are delayed which doesn't help. Secondly, Nemo is a woman in this version, despite being a He in all the original Jules Verne works. And a younger woman at that. Finally, the primary characters are all kids. Just doesn't work with the subject matter.
If you're going to promote this series, promote to the audience it's intended for. Don't have the title in English and then shock the audience with all Spanish dialogue.