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The Marconi International Marine Communication Company specified CQD (audio featured) as the distress signal to be used by its operators.

Marconi Company

1897–2006 British telecommunications and engineering company

The Marconi Company was a British telecommunications and engineering company founded by Italian inventor Guglielmo Marconi in 1897 which was a pioneer of wireless long distance communication and mass media broadcasting, eventually becoming one of the UK's most successful…
Source: Wikipedia (CC BY-SA)

CQD

Morse code distress call in the early 20th century

CQD is one of the first distress signals adopted for radio use. On 7 January 1904 the Marconi International Marine Communication Company issued "Circular 57", which specified that, for the company's installations, beginning 1 February 1904 "the call to be given by ships in…
Source: Wikipedia (CC BY-SA)

Distress signal

Internationally recognized means for obtaining help

A distress signal, also known as a distress call, is an internationally recognized means for obtaining help. Distress signals are communicated by transmitting radio signals, displaying a visually observable item or illumination, or making a sound audible from a distance.
Source: Wikipedia (CC BY-SA)