The video shows a man transporting a fish from a bucket of nice fish-friendly water to a container filled with an unspecified substance (we know it's not liquid nitrogen, as the temperature is shown at -35 in the beginning, which is too warm for nitrogen to still be in liquid form, no matter the unit).
A subduction zone is formed at a convergent plate boundary when one or both of the tectonic plates is composed of oceanic crust. The denser plate, made of oceanic crust, is subducted underneath the less dense plate, which can be either continental or oceanic crust.
Convergent plate boundaries. 1  Oceanic-continental The denser oceanic slab slides under the continental slab. The contact region is called a subduction zone, and a trench is formed there. 2  Oceanic-oceanic One of the oceanic plates slides underneath the other. The region of contact is again called a subduction zone.