"In memoriam" is a document in The Sinking City.
It can be found on the bulletin board in Charles Reed's room in the Devil's Reef Hotel. This particular document will only appear after completing Lost at Sea if Charles Reed tells Robert Throgmorton that the expedition members have died.
It is presumably a newspaper article from the Oakmont Chronicle noting the apparent demise of the expedition.
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Today, we are all shaken by the tragic death of the promising researchers who went to study the depths of the sea, but were doomed to never return.
The city mourns the loss of these brilliant minds who laid down their lives for the sake of science.
The names of the expedition members will be engraved on a memorial established at Oakmont University.