In which the Nautilus glides swiftly through the remote seas, its captain revealing curious scientific observations of oceanic temperatures and salinity, whilst the crew marvelling at the phosphorescent marine life illuminating the depths in a silent aquatic theatre. Yet amid these wonders, a sudden dark mood descends as Captain Nemo, with inscrutable purpose, confines his guests and ensures their sleep, foretelling a turn in their submerged voyage.