On the way down, a number of unusual creatures are witnessed, such as transparent squid and jellies, whose photophores give pulsating displays of colour.
These are a class of short-period (six hours at most) pulsating stars that have been used as standard candles and as subjects to study astroseismology.
The ventilation rate for single-sided ventilation can be accurately predicted by combining different models for mean flow, pulsating flow and eddy penetration.