Abstract: A knife has a first head and a second head. The first head has a first pair of arms and a first pair of knife edges. Each arm of the first pair of arms hangs over a different knife edge of the first pair of knife edges. Similarly, a second head has a second pair of arms and a second pair of knife edges. Each arm of the second pair of arms hangs over a different knife edge of the second pair of knife edges. The first head is connected to the second head.

Abstract: A knife has a first head and a second head. In one embodiment, the first head has a first pair of arms and a first pair of knife edges. In an embodiment, each arm of the first pair of arms hangs over a different knife edge of the first pair of knife edges. Similarly, in an embodiment, a second head has a second pair of arms and a second pair of knife edges. In an embodiment, each arm of the second pair of arms hangs over a different knife edge of the second pair of knife edges. The first head is connected to the second head. In an embodiment, the knife has a cover that slides between different positions to selectively cover one or more of the blades of the knife.

Abstract: A diver's knife that includes a casing with a bottom portion, a top half and a bottom half, a handle slot disposed on bottom portion of casing to allow a user to grasp diver's knife, a single-sided cutting blade to cut a line with a cutting edge with a top end and a blade aperture, with the single-sided cutting blade being sandwiched between top half and bottom half of casing. The diver's knife also includes a slot disposed on a side of casing to receive a line to be cut by an exposed single-sided cutting blade with cutting edge and an fastener to secure top half of casing, single-sided cutting blade and bottom half of casing together to form diver's knife. The diver's knife can also be double-sided to cut the line from both sides.