"Underwater Spearfishing" was produced with assistance by Captain Hal Messinger, a diver of some renown. It shows free divers training, and the successful hunt for a manta ray. The film was released by the Sea-Net Company of Los Angeles, an early manufacturer of free diving and spearfishing equipment, including spear guns, rubber masks, and fins.
| Actor | Role |
|---|---|
| HHal MessingerFishing Boat Captain | Fishing Boat Captain |