umibōzu would often come in swarms as naked bōzu-like beings and attack ships, and they would do things like cling on to the hull and scull as well as put out the basket fire. It is said that they would sometimes let out a voice saying "yaa yaa" while swimming, and when hit with the scull would let out shrieks of "aitata". Their weakness is tobacco smoke, and it is said that if one is unlucky enough to encounter one, having one of those ready can lead to being saved.