Editing A Fall of Moondust (section)

==Plot== 
By the 21st century, the [[Moon]] has been colonized, and although still very much a research establishment, it is visited by tourists who can afford the trip. One of its attractions is a  cruise across one of the [[Lunar mare|lunar seas]], named the ''Sea of Thirst'', (located within the [[Sinus Roris]]) filled with an extremely fine dust, a fine powder far drier than the contents of a terrestrial desert and which almost flows like water, instead of the common [[regolith]] which covers most of the lunar surface. A specially designed "boat" named the ''Selene'' skims over the surface of the dust in the same manner as a [[jetski]].

But on one cruise, a [[moonquake]] causes a cavern to collapse, upsetting the equilibrium. As the dust-cruiser ''Selene'' passes over, it sinks about 15 metres below the surface of the dust, hiding the vessel from view, and trapping it beneath the dust. Immediately there are potentially fatal problems for the crew and passengers inside. The sunken ''Selene'' has a limited air supply, there is no way for heat generated to escape, communications are impossible, and no one else is sure where ''Selene'' has been lost. As the ''Selene'' heats up and the air becomes unbreathable, young Captain Pat Harris and his chief stewardess Sue Wilkins try to keep the passengers occupied and psychologically stable while waiting to be rescued. They are helped by a retired space ship captain and explorer, Commodore Hansteen, who is initially traveling incognito.

Chief Engineer (Earthside) Robert Lawrence is sceptical that a rescue can be mounted, even if the ''Selene'' can be located. He is ready to abandon an initially unsuccessful search, when he is contacted by Thomas Lawson, a brilliant but eccentric [[astronomer]] who, from his vantage point on a [[satellite]] high above the Moon, ''[[Lagrangian point|Lagrange II]]'', believes he has detected the remains of a heat trail on the surface. An expedition is organised and Lawrence indeed makes contact with the ''Selene''. However the completely alien environment results in numerous unforeseen complications. The rescue mission decides to sink a tube supplying oxygen to the ''Selene'' first, in an effort to buy time to think of a way to get the passengers out. However, this becomes a race against the clock, as the heat in the ''Selene'' knocks out the chemical air purification system and the passengers are suffering from [[Hypercapnia|CO<sub>2</sub> poisoning]]. To preserve air, most passengers enter a chemically induced sleep, with only Pat Harris and physicist Duncan McKenzie staying awake. Just in time, the rescuers manage to drill a hole in the roof and deliver an air supply.

A plan is hatched to save the passengers of the ''Selene'' by sinking several concrete [[caisson (engineering)|caisson]]s to the roof of the ship and cutting a hole. When the first caisson is sunk, disaster strikes again: the liquid waste of the passengers had been expelled out of the ship, turning the dust around it into mud, which causes another, smaller, cave-in. The ''Selene'' sinks once more, this time only a small distance, but crucially, at a slope. The caissons cannot be connected to the roof which is now sloping at 30 degrees. The air supply and communications have also been damaged. After restoring these latter two, a new plan is made to sink the caissons, but now the bottom one has a flexible fitting attached to it which can be mounted to the sloping roof of the ''Selene''. The rescue mission works according to plan: the caissons are sunk, the dust is scooped out and the connection is made, but now time is running out again. When the air supply holes were drilled, ''Selene'''s double hull was breached and the space in between slowly filled with dust. The metal-rich dust reached the battery packs and short-circuited them. This causes the battery compartment in the stern to burn slowly. The resulting breach is barricaded by the passengers, but dust is still pouring in and there is a fear that the burning material will cause the [[liquid oxygen]] supply to explode. Meanwhile, Robert Lawrence is working in the rescue shaft: he sets a small [[Shaped charge#Non-military|ring charge]] to make a hole in the roof. Just in time, the hole is made and the passengers escape through the shaft. Captain Harris is the last to leave, up to his waist in dust. Just when he is clear of the shaft, the liquid oxygen explodes, destroying the ''Selene''.

A short [[epilogue]] sees Lawrence writing his [[memoirs]], Pat Harris and Sue Wilkins are married. Pat Harris is the captain of the ''Selene II'' on its maiden cruise which will also be the last cruise for Harris as he is hoping to transfer to the space service.