An underwater storage tank having a flexible multilayer tank containing a working liquid is provided. The flexible multilayer tank has at least one internal electrical insulating layer in contact with the working fluid, at least one external electrical insulating layer in contact with sea water, and at least one intermediate electric conductive layer sealed between the at least one internal electrical insulating layer and the at least one external electrical insulating layer. At least one first electrical connection means is connected to the at least one intermediate electric conductive layer, the least one first electrical connection means being electrically connectable to an electrical grounded measurement instrument to assess physical integrity of the flexible multilayer tank.

A self-weighing container for transporting delivery items includes a weight-sensing device that is configured to sense a weight of a delivery item that is placed inside the container; a microcontroller that is connected to the weight-sensing device; and a display that is connected to the microcontroller. When a delivery item is placed in the container, the weight-sensing device produces a signal that corresponds to the weight of the delivery item and the microcontroller receives the signal and determines the weight of the delivery item based on the signal. The microcontroller may transmit an indication of the weight to the display, which displays the weight based on the indication of the weight, or the microcontroller may transmit the weight to a smart phone for display.

A self-weighing container for transporting delivery items includes a weight-sensing device that is configured to sense a weight of a delivery item that is placed inside the container; a microcontroller that is connected to the weight-sensing device; and a display that is connected to the microcontroller. When a delivery item is placed in the container, the weight-sensing device produces a signal that corresponds to the weight of the delivery item and the microcontroller receives the signal and determines the weight of the delivery item based on the signal. The microcontroller may transmit an indication of the weight to the display, which displays the weight based on the indication of the weight, or the microcontroller may transmit the weight to a smart phone for display.

A self-weighing container for transporting delivery items includes a weight-sensing device that is configured to sense a weight of a delivery item that is placed inside the container; a microcontroller that is connected to the weight-sensing device; and a display that is connected to the microcontroller. When a delivery item is placed in the container, the weight-sensing device produces a signal that corresponds to the weight of the delivery item and the microcontroller receives the signal and determines the weight of the delivery item based on the signal. The microcontroller may transmit an indication of the weight to the display, which displays the weight based on the indication of the weight, or the microcontroller may transmit the weight to a smart phone for display.

A self-weighing container for transporting delivery items includes a weight-sensing device that is configured to sense a weight of a delivery item that is placed inside the container; a microcontroller that is connected to the weight-sensing device; and a display that is connected to the microcontroller. When a delivery item is placed in the container, the weight-sensing device produces a signal that corresponds to the weight of the delivery item and the microcontroller receives the signal and determines the weight of the delivery item based on the signal. The microcontroller may transmit an indication of the weight to the display, which displays the weight based on the indication of the weight, or the microcontroller may transmit the weight to a smart phone for display.

A wall unit (V) for a retaining structure (100) comprises a foot portion (1a) and a wall portion (1b), wherein the wall portion (1b) is inclined with respect to the foot portion (1a), so that it extends over the foot portion (1a). Accordingly, the wall unit (1) is stable during construction and assembly. A corner unit (7) for a retaining structure (100) is adapted to engage with two wall units (1). A retaining structure (100) comprises at least one wall unit (1).

A self-weighing container for transporting delivery items includes a weight-sensing device that is configured to sense a weight of a delivery item that is placed inside the container; a microcontroller that is connected to the weight-sensing device; and a display that is connected to the microcontroller. When a delivery item is placed in the container, the weight-sensing device produces a signal that corresponds to the weight of the delivery item and the microcontroller receives the signal and determines the weight of the delivery item based on the signal. The microcontroller may transmit an indication of the weight to the display, which displays the weight based on the indication of the weight, or the microcontroller may transmit the weight to a smart phone for display.

A self-weighing container for transporting delivery items includes a weight-sensing device that is configured to sense a weight of a delivery item that is placed inside the container; a microcontroller that is connected to the weight-sensing device; and a display that is connected to the microcontroller. When a delivery item is placed in the container, the weight-sensing device produces a signal that corresponds to the weight of the delivery item and the microcontroller receives the signal and determines the weight of the delivery item based on the signal. The microcontroller may transmit an indication of the weight to the display, which displays the weight based on the indication of the weight, or the microcontroller may transmit the weight to a smart phone for display.

A fluid retaining structure comprising an electronic leak detection and location, ELDL, system, wherein the fluid retaining structure comprises inner and outer liners (18, 16) that form electrical isolation layers of the ELDL system, wherein an electrically conductive signal layer (10, 12) of the ELDL system provides structural rigidity to the fluid retaining structure.

A fluid retaining structure comprising an electronic leak detection and location, ELDL, system, wherein the fluid retaining structure comprises inner and outer liners (18, 16) that form electrical isolation layers of the ELDL system, wherein an electrically conductive signal layer (10, 12) of the ELDL system provides structural rigidity to the fluid retaining structure.