"This letter shows that even those who were employed by Shell are deeply concerned by their behavior and their lack of transparency. "Holtzmann's letter warns that children bathing in creeks are in danger of harm from toxic substances, as are people who drink from hand-dug wells.Amnesty International called Shell "deeply irresponsible ... Shell Petroleum Development Co. is the subsidiary in which Nigeria's government is the majority shareholder. The country is one of Africa's largest oil producers.The environmental tests were carried out in August 2015 with support from Shell's headquarters in The Hague, the letter said.which said his contract did not permit publication.Samiama said in a telephone interview that residents' health will be better served by getting on with the cleanup. After a challenging four-year process, "we are on the verge of getting contractors back to the site," he said.Bodo is part of Ogoniland, where the failure to clean up oil spills was called an environmental scandal in 2011 by the U.N.