The Central Sea’s New Geography
A Journey to the Centre of the EarthThis thread traces how the underground sea expands the expedition’s map, creates new scientific possibilities, and redirects the travelers’ route.
increasing
Bearing strength in each event
decreasing
A Shore Beyond Expectation

A Shore Beyond Expectation
A landscape appears
Henry awakens to light, the sound of waves, and the impression of open air. Leaving the grotto, he sees a vast underground sea beneath a high rocky vault.
The scene overturns his expectation that the descent would remain a sequence of narrow tunnels. A broad landscape has appeared beneath the earth, with shorelines, clouds, and distant horizons.
A new map required
Professor Hardwigg names the water the Central Sea and begins thinking about its extent. The travelers must now replace tunnel navigation with the problems of distance, weather, and open-water travel.
The discovery changes the scale and the means of the expedition in a single moment.
A Coast of New Life

A Coast of New Life
Vegetation beneath stone
The travelers find giant mushrooms and enormous plants near the shore. Their size and appearance suggest a world preserving forms associated with ancient periods.
The landscape is beautiful and unsettling, lit by a strange steady illumination beneath a granite ceiling. Henry and the Professor approach it as both a scientific opportunity and a place whose ecological rules remain unknown.
A sea with possible inhabitants
Bones along the shore suggest that ancient animals once lived in the region. The travelers cannot assume the environment is empty simply because the first view offers no living land animals.
The coast invites exploration while warning that its visible stillness may conceal a larger world.
The Harbor and the Raft

The Harbor and the Raft
A vessel from fossil wood
Hans constructs a raft from mineralized wood found on the shore. Professor Hardwigg tests the material, and the wood floats despite Henry’s expectation that fossilization has made it too heavy.
The improvised craft turns the sea from an impassable barrier into a route. A linen sheet becomes a sail, and the group loads provisions and instruments for the crossing.
A personal landmark
Henry names the harbor Port Gretchen before departure. The name brings his distant home into the newly discovered geography.
The raft is both a practical solution and a fragile object carrying the travelers’ hopes across a sea whose far shore remains unknown.
Navigation on Open Water

Navigation on Open Water
A voyage without landmarks
The raft moves rapidly away from shore until the travelers can no longer see land. They record wind, light, direction, and speed, while fishing yields blind species known from ancient deposits.
The open water offers scientific discoveries but few visual points by which to judge progress. The travelers’ estimates of the sea’s size are revised as the distant shore fails to appear.
Threats from below and above
Prehistoric reptiles fight near the raft, and signs of a storm later gather overhead. The sea’s immense scale magnifies both the group’s curiosity and its vulnerability.
Navigation becomes an exercise in maintaining observations amid an environment that can abruptly overwhelm the observers.
The Shore Revisited

The Shore Revisited
A voyage reversed
The storm carries the raft back to a northern shore rather than delivering the expected southern destination. Professor Hardwigg is furious that so much effort has apparently been wasted.
The travelers examine the coast and discover a plain of fossils and traces of Saknussemm. The new shore becomes a place of scientific and navigational importance rather than merely the end of a failed crossing.
Geography redirects the mission
The Central Sea has not led directly to the center, but its storm has placed the party near another passage. The travelers’ map now includes an unexpected return, a new cape, and a route blocked by rock.
The sea’s geography has changed the expedition once again, without yielding the outcome its leader intended.
After Henry wakes in the grotto and reaches the shore
During the party’s first exploration of the sea’s shore
August 12, as Hans completes the raft
During the first week of raft travel
After the party lands on the shore following the storm