Amazing how the high sensitivity digital photography completely outperforms the old (negative) film in
this aspect. ISO 1600 film was "a lot" and it required hard work to get any acceptable scan result from it.
While on a moving yacht in such darkness, sensitivity of ISO 1600 was not enough to ensure a sharp image.
These days, ISO 6400 would be by far superior in terms of grain, ISO 12800 or ISO 25600 most probably as well.