Richard Haliwell's diary

Richard Haliwell's diary was the diary of Victorian Captain Richard Haliwell, detailing the British Imperial Spacefleet's trip to The Moon in 1878. Haliwell began writing in the diary to provide an insight into how astral travel affected the travellers who experienced such a journey, recording both the facts of their discoveries and his own thoughts on what they witnessed.

This diary was discovered in the Time safe by the Fifth Doctor and Turlough, prompting the Doctor to conclude that he would acquire the diary in his future and leave it in the safe for his past self. Having read through the diary to discover that he and Turlough would participate in the expedition, the Doctor stopped reading, not wanting to learn any more about their future in case they were tempted to change it and thus invalidate the diary's warning.

Despite the Doctor's warnings, after Haliwell and Emily Boyes-Dennison were captured by the mysterious Warden, Turlough took the future diary from the TARDIS with the goal of impressing the Doctor with his insight into their current adversaries and using it to rescue Haliwell and Emily. Haliwell continued to update his diary while he was in captivity to explore his insights into their captors, which included recording his own feelings for Emily.

After the expedition had returned to Earth, with Queen Victoria's announcement that astral travel would go no further, Haliwell entrusted the Doctor with the diary, wanting some record of their journey to remain and trusting the Doctor's discretion. Having put the past diary in the time safe to tie up the last loose end, the Doctor decided to leave the version they had originally acquired in the TARDIS library. (PROSE: Imperial Moon)