14 April 1912 / six receptions / two rooms

The Room Next to the Bridge

An ice warning could reach Titanic without reaching the people navigating her. Advance the inquiry record one reception at a time, then change the handoff rule without pretending to know the voyage that would have followed.

6ice-bearing transmissions heard aboard
3documented as reaching Smith or the bridge
2with an identified officer recipient

The frozen delivery rule wins 6 to 3. This is a handoff score, not a claim that Titanic would have avoided the collision. The historical branch happened. The other branch did not.

Base instrument / the release replay

Move the night forward

The clock uses reception times printed by the British report. The last informal Californian call is placed at about 23:00 for display only. Its source gives Californian ship time and New York time, not an exact Titanic-clock conversion.

23:40 Titanic timeCollision cutoff. The complete pre-collision ledger is visible.

6used at this cutoff
0later than this cutoff
0excluded for a stated cause
0without a parseable display time

6 used + 0 later + 0 excluded + 0 undated = 6 archive rows

Marconi room

6 heard

Bridge side

3 delivered
Reported ice positions and Mesaba warning area A longitude and latitude plot. It shows message positions available at the selected cutoff and the inquiry's reported wreck position.

All 6 releases drawn. The Mesaba rectangle contains the inquiry's wreck position. Point sightings are marks, not invented hazard areas.

Control 3 / the honest counterfactual

Freeze one rule before the last records arrive

Rule: every ice-bearing transmission heard aboard is carried to the bridge within two minutes, regardless of addressee, commercial priority, or formal message prefix.

Historical handoff3 / 6documented bridge deliveries
same six receptions
Frozen rule6 / 6required bridge deliveries

What this does not score: collision avoidance, lives saved, or a course Titanic never sailed. The British report says Mesaba perhaps would have affected navigation. It does not say what the altered navigation would have been.

Depth instrument / provenance before verdict

A message has more than one kind of arrival

Change the lens. Physical receipt, bridge handoff, and an identified recipient are different claims. The inquiry supports them with different evidence.

Position probe

Test a coordinate only against messages that define an area. A point sighting does not become an area by implication.

Mesaba contains this point

1 area message tested. The other 5 records are unscored because they do not define hazard areas.

Control 4 / unavailable at the cutoff

The messages could not locate the iceberg

No pre-collision message disclosed the position, size, orientation, or drift of the particular iceberg Titanic struck. The reports described earlier sightings and regions of ice, not a tracked obstacle.

  • The officers could know they were entering a region where ice might be expected. The report says they did.
  • They could not learn from these messages how far away the collision iceberg would become visible in a flat calm.
  • The calm sea was observable aboard, but the visibility distance of that particular berg was not in the message record.

The check

Published anchor5 formal ice messages in the report section titled "Ice Messages Received."
Complete ledger6 ice-bearing receptions after adding the later informal Californian call.
Bridge balance3 bridge-side + 3 wireless-only = 6.
Recipient evidence2 identified + 1 unidentified = 3 bridge-side handoffs.
Spatial resultMesaba's printed rectangle contains 41 degrees 46 minutes north, 50 degrees 14 minutes west. No other row defines a testable area.
Complete run6 of 6 release steps replayed. No crossing or reversal is hidden.

Firewall negative control: checking a planted future message.

Uncertainties and free choices
  • Lost original: Bride testified that none of Titanic's message records survived. This is an inquiry reconstruction, not an intact wireless log.
  • Unidentified handoff: Bride said he delivered the first Californian report within about two minutes, but could not name the officer.
  • Clock choice: the informal final call is displayed at about 23:00. Its source time is Californian ship time, with a separate New York-time report. No exact Titanic-time conversion is claimed.
  • Geometry choice: only Mesaba supplied bounds suitable for a containment test. Point sightings and Caronia's line report stay unscored.
  • Position source: the cross on the map is the inquiry's reported wreck position, not a modern seabed survey coordinate.
  • Frozen rule: universal delivery within two minutes is a declared counterfactual rule, not a rule shown to have existed aboard.
  • Counterfactual limit: delivery completeness and message-area coverage are scored. Avoidance and survival are not.

The verifier reads the shipped page and model at research/titanic-ice-warning-firewall/verify.mjs. The arithmetic is recomputed in this browser from the six-row ledger below, not copied from these labels.

Sources and scope

The surviving record

The 1912 report is public domain in the United States. The six-row dataset on this page is a fresh factual transcription with source notes. No original Titanic wireless log survives, and no third-party asset or live data service is used.