He made an altar of bronze, twenty cubits long and twenty cubits wide and ten cubits high. Then he made the sea of cast metal. It was round, ten cubits from brim to brim, and five cubits high, and a line of thirty cubits measured its circumference. Under it were figures of gourds, for ten cubits, compassing the sea all around. The gourds were in two rows, cast with it when it was cast. It stood on twelve oxen, three facing north, three facing west, three facing south, and three facing east. The sea was set on them, and all their rear parts were inward. Its thickness was a handbreadth. And its brim was made like the brim of a cup, like the flower of a lily. It held 3,000 baths. He also made ten basins in which to wash, and set five on the south side, and five on the north side. In these they were to rinse off what was used for the burnt offering, and the sea was for the priests to wash in. 2 Chronicles 4:1-6.
Archeologists and artists help fill in some of the spaces left by the Bible. For instance, it has been discovered that Solomon had built reservoirs and conduits to fill the sea at the temple. And I could not imagine the priests having to climb up and into the sea to bathe, in public. It would have been a small matter to run a pipe out to feed smaller basins for ceremonial washing.
For we know in part and we prophesy in part, but when completeness comes, what is in part disappears. 1 Corinthians 13:9-10 NIV
Until completeness, the physical fulfillment of the kingdom of God comes, there will be details we can only imagine.