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_86 ( launched VARCHAR, fleet VARCHAR, number VARCHAR )

### Question ###
when was the number l6, with a fleet of black sea, launched?

### Accurate SQL ###

SELECT launched FROM table_name_86 WHERE fleet = "black sea" AND number = "l6"