"The Californian" was about ten miles away from the "Titanic" as the "Titanic" foundered and saw her distress flares, saw her disappear and the "Californian" did nothing to immediately help. It's all documented both in the UK's and the USA's official inquiries of the tragedy.
I never knew this until about five years ago.
"The Other Side of the Night: The 'Carpathia,' the 'Californian,' and the Night the 'Titanic' Was Lost" by Daniel Allen Butler - - fascinating book.