Did you read what I wrote? I already laid it out. The US degrades the mines, mine laying vessels, and so on. Then the risk is reduced to a level that's acceptable for commercial shipping. That level isn't zero, despite what people say online. If you want a historical case study, look at the 1980s.

You can drop a sea mine from literal speed boat. Just kick it into a water. Why would you want to use a slow purpose build mine layer for that?