A sealed tide-gauge annex, a padlock untouched, and an arm-sized gap in a ventilation panel - how did that expose them?
The ventilation panel that shoved an arm out and sealed her fate
In this episode, we follow the discovery of senior coastal survey technician Kathleen Marsh inside a locked Harwick County tide gauge annex and the sequence of clues that made the sealed building inexplicable. The episode traces the scene, the building details, and the early investigative choices that turned a simple padlock into the central mystery: how could anyone have left?
Person: Kathleen Marsh, 37, senior coastal survey technician
Date: November 7-8 (final log entry 6:40 p.m., discovered 7:41 a.m.)
Location: Harwick County tide gauge annex, Aldous Spit, Maine
Cause: Blunt force trauma (medical examiner estimate time of death 6-9 p.m.)
Building detail: Two 14-inch ventilation panels; north panel has ~4-inch gap at top edge
- Deputies found the annex locked with an undamaged brass padlock and Kathleen’s notebook open to a 6:40 p.m. calibration log entry.
- The annex is a one-room, garage-sized building housing analog tide gauge equipment, secured by one door and two ventilation panels fixed with interior wing nuts.
- Colleagues noted Kathleen’s methodical routine and a perfect attendance of 300 consecutive pier calibration walks; an office admin heard her boots at 5:48 p.m, on November 7.
- The harbormaster’s liaison, Tom Adler, had one of only two keys, his key fit and turned the padlock, and he had no confirmed alibi for the evening.
- A structural engineer noted a four-inch gap above the north ventilation panel-too small for a person but large enough for an arm-and that observation went unacted for six weeks.
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