Running in Eagle from January 1965 (Vol. 16 No. 2) until the penultimate issue in April 1969 (Vol. 20 No. 16), The Guinea Pig told of the adventures of Mike Lane whose job was to test the inventions of Professor Dee. This story appeared in the 1966 Eagle Summer Special. (Click for larger images).
Mike gives a spectacularly bad piece of advice on page three of the story. it's a good job the other diver can't hear him! Can we spell "lung over-expansion injury" boys and girls?!