Best wishes for an unexpected discovery:
May you trip in the scaevola and find yourself nose-to-nose with a skull, which proves to be a skeleton buried in a shallow grave, with a sextant as a tombstone crudely scratched on the frame with the word NOONAN.
May the ROV propellers fowl on a wire, and when retrieved found to be attached to a box bearing a tag: TRANSMITTER, Western Electric, Model 13C.
May your lunch sandwich be stolen by a coconut crab, and when chased into its burrow also found to have years earlier snatched a stoppered bottle containing a diary written from torn pages of a aircraft log, and a pilots license.
May the currents and wind push the boat over an unimportant part of the reef slope, only to see on the sonar the distinct outline of a twin vertical tail structure.
May the anchor fowl on the bottom, and when eventually recovered be found to be hung into the corroded remains of a radial engine.