Details of the Panama Canal locks are here: https://en.wikipedia.org/wiki/Panama_Canal_locks Looks like there are 3 sets of named locks, but one set has 3 chambers, one 2 chambers and one just 1 chamber, so arguably there are in fact 6 separate lock stages.
Looks like there are 3 sets of named locks, but one set has 3 chambers, one 2 chambers and one just 1 chamber, so arguably there are in fact 6 separate lock stages.