Small fishing boat in Fort Augustus Lock in 1967

This is a slightly under-exposed colour slide of a small fishing boat in-transit in the Fort Augustus Lock in Scotland - taken in 1967.

The majority of the slides in this series have been very well exposed so I wonder if this was simply metered incorrectly (on the sky rather than the boat?) or if the light was simply very low and the photographer tried a shot on the max shutter speed he could hand hold at? For more information on the rest of the slides in this series, either choose one from the series viewer below or read the full story here.