The housing "box" used to hold the whales at Sealand was a relatively small enclosure made of metal and concrete, with a shallow pool of water for the whales to swim in. The enclosure was just a few meters larger than the whales themselves, and offered little space for them to move or engage in natural behaviors.
In my opinion, the size of the enclosure was inadequate for the whales' physical and mental well-being, and the number of whales held in a single enclosure was also problematic. The enclosure was suitable for a single whale at most, but at Sealand, multiple whales were often kept in the same small space, which would have caused stress and conflict among the animals.
Furthermore, the amount of time the whales spent in the enclosure was also concerning. The whales were kept in the enclosure for hours or even days at a time, with little stimulation or social interaction. This would have been extremely detrimental to their health and welfare, as whales are highly social and intelligent animals that require ample space and social interaction to thrive.
Overall, the housing "box" used to hold the whales at Sealand was a poor and inadequate environment for the animals, and it is unfortunate that they were subjected to such conditions for so long.