I will start off by saying I have knowledge in neither marine biology nor architecture. However, I'm writing this note to help you find answer to your question.
Anything related to career is extremely sensitive, so before relying on an internet answer, you should probably talk to someone you know. This can be your school's counselor, class teacher, high school biology teacher or - this will be most helpful - if you can, talk to a marine biology and/or architecture professor of a university. If there is an university near to where you live, you might want to get in contact with the biology or architecture professor.
Secondly, get in touch with people who have studied marine biology and architecture. Conversation with anyone is possible, thanks to the internet and social media platforms, so you might want to follow marine biologists and architects and then ask them career-related questions.
That being said, I believe it's more important to talk about this with people you already know. If you are in school, utilize that fact by talking to your teachers. Ask them if they know any colleagues/friends who are into marine stuff and try to network if they do know.