M1011 Moray space mine

Moray Space Mines are explosives built by the UNSC for use in deep-space combat. These mines carry a high explosive payload and small chemical propellant drives that allow them to track specific targets or maintain a pre-defined coordinate location in space.

Background
They are dropped from the bays of Longsword Interceptors to mine locations within space from incursion. They use both proximity and remote detonators and have very high explosive payloads. This may not be a regular armament as the Master Chief noticed that the Cryo-Tube had been removed to make way for this. During the Assault on Ascendant Justice, these were used to destroy the ship's Seraph Fighters making way for a Longsword to land on the Covenant ship. They may have adhesive or magnetic quality to them as they were able to be attached to a remote piloted Pelican and later deployed from it.