The British parliament has opened a parliamentary inquiry into nuclear testing on Christmas Island in Kiribati in the 1950s.
Hundreds of British, New Zealand and Fiji veterans say the test fallout made them ill and they are claiming compensation from the UK government.
The Ministry of Defence is investigating the claims.
Members of Parliament have heard testimony from scientists who are calling for further British research into possible genetic damage amongst veterans and their families.
A recent study by experts at Massey University in New Zealand suggested test veterans had suffered chromosomal damage.
Some British scientists want to repeat the tests in the United Kingdom.