MONTREAL - Jeremy Hansen says no specific time frame is being discussed, but the Canadian astronaut says he feels he'll be taking his first trip into space by 2020.

NASA has said no Canadians will be heading up to the International Space Station anytime soon because all flights have been booked through the end of 2016.

Another opportunity could open up in 2019-2020.

The 38-year-old rookie astronaut tells The Canadian Press he predicts Canada's space program will grow and that more and more Canadians will be flying in the 2020s.

Hansen made the comments today during an interview from Aquarius, an undersea laboratory about six kilometres off Key Largo in the Florida Keys.

Hansen has been part of a group that's spent the past week 19 metres underwater in conditions that closely resemble a space environment.