One or two unrelated ideas

Over the bank holiday weekend we came up with the following plot:

PARKER is being taught to sail by CLAIRE, when the tide goes out and they end up stranded in the tidal pool on Broadstairs beach. Then STAN surfaces in a mini-sub.

Also PARKER should say "There will be an accounting for this days work, mark my words!"

(Or maybe "For your actions, you will be held to account")