Single Ping
One ping only.
Note to SmithL: the above Ping list is maintained by FReeper Doohickey. You can access the list by going to Doohickey's profile page and copying it (which is what I do) to ping all the FReepers interested in sub-rlelated matters.
Our thanks - again - to Doohickey, who was 'volunteered' to maintain a submariner ping list... and actually took the ball and ran with it!