殚精极虑

精 = 米 + 青 : Joan of Arc scoops a bit of water from the fountain of youth in front of the engine and pours it into a bowl of rice. The water refines the rice into rice wine, and as Joan of Arc drinks it, she finds her spirit renewed.

极 = 及 + 木 : As Joan of Arc (ji) and Yuwen Huaji (及) pass over the north pole (及) at Christmas just inside the space station's entrance (Ø2) they decide to celebrate this moment by having a little contest. Between them there is a rather large Christmas tree (木) and they decide that whoever climbs to its top (极) first is the winner.

虑 = 虍 + 心 : As Loki (lü) is a hypochondriac (虑) he always filters (滤) bottled water (氵) multiple time in the space station's bathroom (Ø4) before he drinks it.