In the Bible, things that are lower down, or under, physically, generally represent things that are lower or more external spiritually. In some cases, the lower things have been separated and put away to protect the good, but in others, it can mean that a less exalted idea or good desire is supporting a more exalted one.

(सन्दर्भ: Arcana Coelestia 4564 [1-2], 8610, 9656)

'To open,' as in Revelation 9, signifies communication and conjunction.

(सन्दर्भ: Apocalypse Explained 537)