Probably because it had been oversold and the markets might be anticipating a rise in oil. Also OSH bounced off a low of $1.66 - for the third time (recent lows $1.65 and $1.66).
Anything else would be speculation - I can only think perhaps another customer for the pipeline or a go-ahead for the methanol plant of CNG to NZ or ... its got plenty going for it!
H