@Mazoshi1987Am I wrong giving a PC with a swim speed Disadvantage on attack rolls using a great sword or a war hammer under water? You don't suffer the disadvantage if you have a swimming speed.
— Jeremy Crawford (@JeremyECrawford) November 14, 2016
@JeremyECrawford Why would having a swimming speed effect your ability to use a fairly unwinnable weapons?
— Steven Connor (@Mazoshi1987) November 15, 2016
The underwater combat rules treat a swimming speed as representing a general fluency with aquatic motion. #DnD https://t.co/IMC8Hde4Wj
— Jeremy Crawford (@JeremyECrawford) November 15, 2016