No injured cavers recorded.
On Tuesday, December 27, 1983, a group of four cavers entered Thanksgiving Cave on Vancouver Island to do a thru-trip, between different entrances. In the course of this they split up, two completing their trip, exiting via a second entrance. The other two (both 22) did not appear, however. The first two re-entered the cave but could not locate the missing pair. The two caver organizations on the Island, VICEG and BCSF (Vancouver Island Cave Exploration Group and British Columbia Speleological Federation) were notified and a cave search was initiated. The two were found, in good condition, after having been in the cave for 29 hours.
The cavers had a "good knowledge of the survey" of the cave so this was not a foolish event. To be sure of thru-trips take someone who knows the way.
Two cavers became lost during a thru-trip in Thanksgiving Cave and were found after 29 hours.