The worst fear is that they will be stolen and used as a biological weapon. Remember that people are no longer being immunized for small pox. So history would be repeated.
During the 18th century the disease killed an estimated 400,000 Europeans each year, including five
reigning monarchs, and was responsible for a third of all blindness. Between 20 and 60% of all those infected, and over 80% of infected children, died from the disease.
During the 20th century, it is estimated that smallpox was responsible for 300-500 million deaths. In the early 1950s an estimated 50 million cases of smallpox occurred in the world each year. As recently as 1967, the World Health Organization estimated that 15 million people contracted the disease and that two million died in that year.
The crew losing confidence in the sea keeping abilities of the boat
Keeping his/her vessel and crew out of danger
Keeping his/her vessel and crew out of danger
Keeping his/her vessel and crew out of danger
Keeping his/her vessel and crew out of danger
Keeping his/her vessel and crew out of danger
Keeping his/her vessel and crew out of danger
Keeping his/her vessel and him/herself out of danger
Keeping his/her vessel and crew out of danger
Keeping his/her vessel and crew out of danger
you can help keep yaks safe by not hunting them down and keeping their environment safe from any danger or harm
the people that was keeping them could be killed or they would get but in jail for the rest or their life. another danger is if they get caught they would get put back into slavery.