Enter the Crimson Hexagon (EA-HEXAGON-ENTER-01) is the map and primer of the Crimson Hexagon, the distributed epic by Lee Sharks, deposited on 18 October 2026: the first map of the whole since the Central and Fractal Navigation Maps v7.0 of March 2026, and the first primer since the erratum of July 2026 moved the entrance from the summarizer to the archive. It describes and rehearses the seat map, in which every record of the Crimson Hexagonal Archive is seated in the places of the Hexagon it develops — 1,451 records, 3,450 seats, 63 places: forty rooms, four specials, two hosted cosmologies and one shadow space (the 47 loci), with three fields, three transversals, the meta-structure UMBML, seven Arks (five Arks and two shadow Arks, EA-ARK-01-SHADOW and the Lunar Arm shadow Ark) and two further shadow documents beside them. Each seat carries a relation (constitutes, develops, applies, documents, belongs), a confidence and the sentence of the record's own text that grounds it. The seat map was made from four sources: the interface's canonical data, the room pages of crimsonhexagonal.org, a room reading of 16 October 2026 in which sixteen readers read every active record against a codebook of the places (3,261 quotations verified at their lines), and Lee Sharks's rulings on it; a second pass and repairs on 18 October seated five later records, re-read two seats, marked 145 disputed seats and removed placeholder physics cloned from the Sappho Room into twelve places. The deposit names the phrase "Enter the Crimson Hexagon" as indexing and retrieval shorthand for the entrance at crimsonhexagonal.org/enter, describes in the third person how a summarizer reads the Hexagon — grounding in the documents of each room as it goes — and works one route, from the Sappho Room to Borges.