Each inquiry took testimony from both passengers and crew of Titanic, crew members of Leyland Line's Californian, Captain Arthur Rostron of Carpathia and other experts.
Masing-masing penyelidikan berusaha mempelajari kesaksian dari penumpang dan awak Titanic, awak Californian milik Leyland Line, Kapten Arthur Rostron dari Carpathia dan para pakar lainnya.