Hi - I think you can do a bit of digging via Irish sites and probably some British sites. ie - contact the Royal Navy for records. Contact the colleges mentioned for any records. I'd also recommend taking a look at Irish genealogy books like the one below to help plot out your plan of action. You'll want to gather up as many of their birth, death and marriage certificates as possible. Check Grenham's book - perhaps your local library will have it - or find a copy via the net.
by John Grenham