Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_name_75 (message VARCHAR, designation_hd VARCHAR)

### Question ###
What message has hd 186408 as a designation HD?

### Accurate SQL ###

SELECT message FROM table_name_75 WHERE designation_hd = "hd 186408"