Heel her off

When you’re aground and the tide is a long time coming (or worse), if all else has failed, try attaching a rope to a spare masthead halyard. The angle of heel this can produce is dramatic and may well lessen your draught sufficiently to do the business. If you can’t muster a handy RIB like this chap, run your line to a mooring or lay out an anchor and hitch the halyard to the kedge, then crank the halyard in and watch her crunch off sideways. A drastic situation can sometimes justify drastic methods.