A grotto used to be merged here, but it has disappeared since then: https://www.tamriel-rebuilt.org/bugtracker/missing-grotto-2
Also, the door has been duplicated and one of them should be deleted.

Record: CELL "padomaic ocean region (42, -18)" Flags:0x0000 ()
  NAME: Name:
  NAME: Name:ex_cave_door_01
  DATA: X:350605.313  Y:-144389.531  Z:-2003.025  X_Angle:0.0000  Y_Angle:0.0000  Z_Angle:5.6032
  NAME: Name:ex_cave_door_01
  DATA: X:350598.969  Y:-144400.594  Z:-2003.025  X_Angle:0.0000  Y_Angle:0.0000  Z_Angle:5.6032