Add spaces: SCUBAinsteadofsnorkeltripadd$70USDperperson(mustbecertified)

Answer: SCUBA instead of snorkel trip add $70 USD per person (must be certified)

Add spaces: Theequipmentusedtohandlethebarrelsalsoincreasedplantenergyusageandcosts.

Answer: The equipment used to handle the barrels also increased plant energy usage and costs.

Add spaces: Magnuswaskilled,kingNielsfledtothetownofSlesvig,butthetown-dwellersavengedbykillingkingNiels.

Answer:
Magnus was killed, king Niels fled to the town of Slesvig, but the town-dwellers avenged by killing king Niels.