In the Star Trek movie First Contact, Jean-Luc Picard mentions something about the environment on deck 16 being like a Borg ship. Lt Worf states the temperature as 39.1 degrees Celsius (102.38 deg F) with a relative humidity of 92 percent.
The effective humidex is 69.4 Deg C (156.9 Deg F). This would kill most lifeforms including Picard's crew, with the exception of Lt Data, in a very short time.
How do the Borg and all the assimilated species survive such conditions?