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Fig. 2. Schematic of the pool used in the measurement of diving metabolic rate. The
entire surface of the pool is covered by aluminium mesh so that the seal can
only surface and breathe in the box situated in one corner. The pool is
divided into lanes using nets, so that during measurement the seals can travel
a maximum of 168 m away from the breathing box. The depth of the pool is 2.5
m.