An amphibious (or dual-medium) access point (AAP) is a floating device placed on the water surface and mounted at anchor or on water structures such as piers, buoys, bridge supports, vessels, etc. And in some cases it is possible to use free drifting access points as well. AAP is designed to provide access to submarine autonomous sensor data, control remote submarine actuators, and determine the geographical location of remote nodes in the submarine network.

Externally, the AAP is a radio module antenna and a Hadean NODE hydroacoustic modem on the cable. The GNSS and GSM/3G module antennas are under a radio cover. The device case is made of strong plastic, resistant to UV radiation and sea water and has a load-bearing eyelet for anchoring.

The AAP has positive buoyancy and its axis of mass is shifted downwards so that when submerged in water it adopts a vertical position.