The seeds will not be viable.

Try soaking them in a kelp extract solution

It’s hard to wrap my brain around the fact that the eighties were four years ago. I would try using the water starting method, where you put the seeds in a glass of water and set that in a dark cupboard. If the seeds float you might be able to hatch them. I used this method several times and it works pretty good. Seems like it could help them get out of the helmet. If you get them to sprout that would be amazing.